Apply a thin coating of glue to the surface.

在表面上薄薄的水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种布方式，成功地解决了水性金属油墨的布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁合金钒酸盐和料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时布有效地解决了双面二次布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化料和印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

料中的气体将影响到布纸质量和布机的运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂和光敏剂等方面讨论了该料的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表面作为防锈料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸、硝基纤维素等成药品包装用铝箔保护料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸和烘干完成。

A plastic coating repels moisture.

塑料能防潮。

W-a coating of grease over all exposed surface

在全部露出的表面上油。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳的加入量为2.0%~4.0%时，对料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀有光泽不易变色。

Apply a thin coating of glue to the surface.

在表面涂上薄薄的一层胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种涂布，功地解决了水性金属油墨的涂布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

涂层具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁金钒酸盐和涂料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时涂布有效地解决了双面胶二次涂布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌层是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化涂料和胶印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

涂料中的气体将影响到涂布纸质量和涂布机的运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预物、活性稀释剂和光敏剂等面讨论了该涂料的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表面作为防锈涂料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复溶作基体改进剂，锆涂层热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等药品包装用铝箔保护涂料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸胶和烘干完。

A plastic coating repels moisture.

塑料涂层能防潮。

W-a coating of grease over all exposed surface

在全部露出的表面上涂一层油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶的加入量为2.0%~4.0%时，对涂料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖一层浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀层有光泽不易变色。

Apply a thin coating of glue to the surface.

在表面上薄薄的一胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种布方式，成功地解决了水性金属油墨的布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

具有高绝缘性阴极分解力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁合金钒酸盐料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时布有效地解决了双面胶二次布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化料胶印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

料中的气体将影响到布纸质量布机的运行性。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂光敏剂等方面讨论了该料的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁其他易氧化金属表面作为防锈料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等成药品包装用铝箔保护料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸胶烘干完成。

A plastic coating repels moisture.

塑料防潮。

W-a coating of grease over all exposed surface

在全部露出的表面上一油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶的加入量为2.0%~4.0%时，对料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖一浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀有光泽不易变色。

Apply a thin coating of glue to the surface.

在表面上薄薄的水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种布方式，成功地解决了水性金属油墨的布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁合金钒酸盐和料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时布有效地解决了双面二次布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化料和印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

料中的气体将影响到布纸质量和布机的运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂和光敏剂等方面讨论了该料的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表面作为防锈料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸、硝基纤维素等成药品包装用铝箔保护料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸和烘干完成。

A plastic coating repels moisture.

塑料能防潮。

W-a coating of grease over all exposed surface

在全部露出的表面上油。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳的加入量为2.0%~4.0%时，对料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀有光泽不易变色。

Apply a thin coating of glue to the surface.

在表涂上薄薄的一胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种涂布方式，成功地解决了水性金属油墨的涂布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

涂具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁合金钒酸盐和涂。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双同时涂布有效地解决了双胶二次涂布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

锌是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化涂和胶印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

涂中的气体将影响到涂布纸质量和涂布机的运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂和光敏剂等方讨论了该涂的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表作为防锈涂。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆涂热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等成药品装用铝箔保护涂。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸胶和烘干完成。

A plastic coating repels moisture.

塑涂能防潮。

W-a coating of grease over all exposed surface

在全部露出的表上涂一油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶的加入量为2.0%~4.0%时，对涂流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖一浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡有光泽不易变色。

Apply a thin coating of glue to the surface.

在表面上薄薄的一层胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种布方式，成功地解决了水性金属油墨的布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

层具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁合金钒酸盐和料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时布有效地解决了双面胶二次布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌层是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化料和胶印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

料中的气体将影响到布纸质量和布机的运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂和光敏剂等方面讨论了该料的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表面作为防锈料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆层热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等成药品包装用铝箔保护料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸胶和烘干完成。

A plastic coating repels moisture.

塑料层能防潮。

W-a coating of grease over all exposed surface

在全部露出的表面上一层油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶的加入量为2.0%~4.0%时，对料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖一层浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀层有光泽不易变色。

Apply a thin coating of glue to the surface.

在表面涂上薄薄一层胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种涂，成功地解决了水性金属油墨涂问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片药味。

The coating has high insulation and anti-cathode decomposability.

涂层具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销产品主要有五氧化二钒、钒铁金钒酸盐和涂料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时涂有效地解决了双面胶二次涂所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌层是用来防止钢铁生锈。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化涂料和胶印油墨上应用。

Air in coating color greatly influences the paper quality and coater runnability.

涂料中气体将影响到涂纸质量和涂机运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预物、活性稀释剂和光敏剂等面讨论了该涂料改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表面作为防锈涂料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复溶液作基体改进剂，锆涂层热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等成药品包装用铝箔保护涂料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎可在线直接进行浸胶和烘干完成。

A plastic coating repels moisture.

塑料涂层能防潮。

W-a coating of grease over all exposed surface

在全部露出表面上涂一层油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶加入量为2.0%~4.0%时，对涂料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大标本是这个给人深刻印象铜明矾--蓝铜矿上边覆盖一层浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀层有光泽不易变色。

Apply a thin coating of glue to the surface.

在表面涂上薄薄一层胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种涂布方式，成功地解决了水性金属油墨涂布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了味。

The coating has high insulation and anti-cathode decomposability.

涂层具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销产品主要有五氧化二钒、钒铁合金钒酸盐和涂料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双面同时涂布有效地解决了双面胶二次涂布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

镀锌层是用来防止钢铁生锈。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化涂料和胶印油墨上应用。

Air in coating color greatly influences the paper quality and coater runnability.

涂料中气体将影响到涂布纸质量和涂布机运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂和光敏剂等方面讨论了该涂料改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化金属表面作为防锈涂料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆涂层热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等成品包装用铝箔保护涂料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸胶和烘干完成。

A plastic coating repels moisture.

塑料涂层能防潮。

W-a coating of grease over all exposed surface

在全部露出表面上涂一层油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶加入量为2.0%~4.0%时，对涂料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大标本是这个给人深刻印象铜明矾--蓝铜矿上边覆盖一层浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡镀层有光泽不易变色。

Apply a thin coating of glue to the surface.

在上薄薄的一层胶水。

Set up 3 coating modes and successfully resolve the coating problem of aquosity metal ink.

设置三种布方式，成功地解决了水性油墨的布问题。

Sugar coating hides the taste of pills.

糖衣掩盖了药片的药味。

The coating has high insulation and anti-cathode decomposability.

层具有高绝缘性能和抗阴极分解能力。

My products mainly include vanadium pentoxide, Ferrovanadium, vanadate and coatings.

我公司经销的产品主要有五氧化二钒、钒铁合钒酸盐和料。

Simultaneity doubt coating effectively solve the twice coating procreant crape effect lowlihead,products baddish lowlihead problem etc.

双同时布有效地解决了双胶二次布所产生地品质问题。

A zinc coating is applied to the steel for rust protection.

锌层是用来防止钢铁生锈的。

The applications thereof in UV curable coatings and photolitho inks are reviewed.

综述了其在UV固化料和胶印油墨上的应用。

Air in coating color greatly influences the paper quality and coater runnability.

料中的气体将影响到布纸质量和布机的运行性能。

The effects of prepolymer, active diluent and photosensitize on coating modification was discussed.

在预聚物、活性稀释剂和光敏剂等方讨论了该料的改性。

It also serves and a rust protection coating on steel and other oxidizable metals.

也可用于钢铁和其他易氧化作为防锈料。

Coating film waterproof, oil-proof, dustproof and lightproof, candy be not intenerated, slimy or changed shape.

包上膜衣，可防水、防油、防尘、遮光，糖果不受潮、不粘连、不变形。

Tartrate solution and zirconyl chloride were used as the matrix modifier for coating graphite tube.

采用酒石酸-锆复合溶液作基体改进剂，锆层热解石墨管为原子化器。

The protective coating on aluminium foils packaging for medicine was formulated with thermosetting acrylic resin,pyroxylin.

采用热固性丙烯酸树脂、硝基纤维素等成药品包装用铝箔保护料。

The production of spunbonded terylen needlepunching waterproof base cloth can be completely by direct dip coating and drying.

纺粘涤纶针刺防水基胎布可在线直接进行浸胶和烘干完成。

A plastic coating repels moisture.

塑料层能防潮。

W-a coating of grease over all exposed surface

在全部露出的上一层油脂。

The PVAC has little influence on rheopexy of water based EPC coating with the content from 2.0% to 4.0%.

白乳胶的加入量为2.0%~4.0%时，对料流变性无明显影响。

Another larger piece was this impressive Chalcoalumite from Bisbee - the light blue coating on Azurite.

另一较大的标本是这个给人深刻印象的铜明矾--蓝铜矿上边覆盖一层浅蓝色。

Lustrousness:tin coating is glossy and not easy to change color.

纯锡层有光泽不易变色。