Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯邻苯二胺为原料通过界面缩聚法
成了聚硫
缓释微胶囊。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯邻苯二胺为原料通过界面缩聚法
成了聚硫
缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙撑硫(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超水相体系相结
的绿色
成法优化缩氨基硫
的
成条件,扩展超
在有机
成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加适当的明胶、硫
,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度的双氧水作为氧化剂氧化硫、氨基硫
来制备相应的
氨基
类化
物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基硫反应,
成了链状冠醚二芳醛缩氨硫
类化
物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环化物
硫
衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基乙酸的成工艺进行了比较研究,认为硫氢化钠法
硫代硫酸钠法生产成本低,适宜于选矿用巯基乙酸的生产,而硫
法可得到较高浓度的巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧化S-甲基异硫盐,
成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异氰酸酯和邻苯二胺为原料通过界面缩聚法合成了聚
缓释
。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙撑(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结合的绿色合成法优
缩氨基
的合成条件,扩展超
技术在有机合成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当的明、
配合,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度的双氧水作为氧剂氧
、氨基
来制备相应的
和氨基
类
合物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基反应,合成了链状冠醚二芳醛缩氨
类
合物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环合物和
衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基乙酸的合成工艺进行了比较研究,认为氢
钠法和
代
酸钠法生产成本低,适宜于选矿用巯基乙酸的生产,而
法可得到较高浓度的巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧S-甲基异
盐,合成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异氰酸酯和邻苯二胺为原料通过界面缩聚法合成了聚
缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结合的绿色合成法优化缩氨基
的合成条件,扩展超
技术在有机合成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当的明胶、配合,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
要介绍了以30%浓度的双氧水作为氧化剂氧化
、氨基
来制备相应的
和氨基
类化合物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基反应,合成了链状冠醚二芳醛缩氨
类化合物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环化合物和衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
对巯基乙酸的合成工艺进行了比较研究,认为
氢化钠法和
代
酸钠法生产成
低,适宜于选矿用巯基乙酸的生产,而
法可得到较高浓度的巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧化S-甲基异盐,合成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表
软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯和邻苯二胺为原料通过界面缩聚法成了聚硫脲缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙撑硫脲(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结
的
成法优化缩氨基硫脲的
成条件,扩展超
技术在有机
成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产加和适当的明胶、硫脲配
,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度的双氧水作为氧化剂氧化硫脲、氨基硫脲来制备相应的脲和氨基脲类化物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基硫脲反应,成了链状冠醚二芳醛缩氨硫脲类化
物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环化物和硫脲衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基乙酸的成工艺进行了比较研究,认为硫氢化钠法和硫代硫酸钠法生产成本低,适宜于选矿用巯基乙酸的生产,而硫脲法可得到较高浓度的巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧化S-甲基异硫脲盐,成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异氰酸酯和邻苯二胺为原料通过界面缩
法合成了
缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙撑(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结合的绿色合成法优化缩氨基
的合成条件,扩展超
技术在有机合成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当的明胶、配合,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度的双氧水作为氧化剂氧化、氨基
制备相应的
和氨基
类化合物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基反应,合成了链状冠醚二芳醛缩氨
类化合物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环化合物和衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基乙酸的合成工艺进行了比较研究,认为氢化钠法和
代
酸钠法生产成本低,适宜于选矿用巯基乙酸的生产,而
法可得到较高浓度的巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧化S-甲基异盐,合成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯和邻苯二胺为原料通过界面缩聚法合成了聚硫脲缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代撑硫脲(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结合的绿色合成法优化缩氨基硫脲的合成条件,扩展超
技术在有机合成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当的明胶、硫脲配合,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主了以30%浓度的双氧水作为氧化剂氧化硫脲、氨基硫脲来制备相应的脲和氨基脲类化合
。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘链状冠醚二芳醛在酸性条件下与氨基硫脲反应,合成了链状冠醚二芳醛缩氨硫脲类化合
。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环化合和硫脲衍生
的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基酸的合成工艺进行了比较研究,认为硫氢化钠法和硫代硫酸钠法生产成本低,适宜于选矿用巯基
酸的生产,而硫脲法可得到较高浓度的巯基
酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸质中,利用双氧水氧化S-甲基异硫脲盐,合成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯和邻苯二胺为原料通过界面缩聚法合成了聚硫脲缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌代谢物乙撑硫脲(ETU)进行
。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
利用超
技术和水相体系相结合
绿色合成法优化缩氨基硫脲
合成条件,扩展超
技术在有机合成中
应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当明胶、硫脲配合,可获得高品
极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度双氧水作为氧化剂氧化硫脲、氨基硫脲来制备相应
脲和氨基脲类化合物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基硫脲反应,合成了链状冠醚二芳醛缩氨硫脲类化合物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续定酸性镀铜光充剂中
巯基杂环化合物和硫脲衍生物
含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基乙酸合成工艺进行了比较研究,认为硫氢化钠法和硫代硫酸钠法生产成本低,适宜于选矿用巯基乙酸
生产,而硫脲法可得到较高浓度
巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介中,利用双氧水氧化S-甲基异硫脲盐,合成了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件
观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯和邻苯二胺为原界面缩聚法合成了聚硫
缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙撑硫(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结合的绿色合成法优化缩氨
硫
的合成条件,扩展超
技术在有机合成中的应用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当的明胶、硫配合,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度的双氧水作为氧化剂氧化硫、氨
硫
来制备相应的
和氨
化合物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨硫
反应,合成了链状冠醚二芳醛缩氨硫
化合物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯杂环化合物和硫
衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯乙酸的合成工艺进行了比较研究,认为硫氢化钠法和硫代硫酸钠法生产成本低,适宜于选矿用巯
乙酸的生产,而硫
法可得到较高浓度的巯
乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧化S-甲异硫
盐,合成了甲
磺酰氯,收率70%。
明:以上例句、词性分
均由互联网资源自动生成,部分未经
人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
Novel controlled releasing polythiourea microcapsules were prepared from terephthaloyl diisothiocyanate and o-phenylenediamine by interfacial polycondensation.
以对苯二甲酰异硫氰酸酯和邻苯二胺为原料通过界面缩聚法了聚硫脲缓释微胶囊。
Since various, cause has not given a test to maneb zinc supersession thing second braces sulfurs urea (ETU).
由于各种原因未对代森锰锌的代谢物乙撑硫脲(ETU)进行检测。
Methods A serials of thiosemicarbazones were synthesized by utilizing aromatic aldehyde,aromatic ketone and thiosemicarbazide in aqueous solution under ultrasound irradiation.
目的利用超技术和水相体系相结
的绿色
法优化缩氨基硫脲的
条件,扩展超
技术在有机
中的
用范围。
In copper electrolytic refining,high quality cathode copper can be produced by adding WHN1 together with suitable amount of gelatin and sulfocarbamide.
电解生产时该添加和适当的明胶、硫脲配,可获得高品质的阴极铜。
This thesis mainly introduced that ureas and semicarbazides were synthesized by oxidation of corresponding thioureas and thiosemicarbazides using 30% peroxide as oxidant.
本文主要介绍了以30%浓度的双氧水作为氧化剂氧化硫脲、氨基硫脲来制备相的脲和氨基脲类化
物。
Under acid condition open chaining crown ether diaromatic aldehyde can react, and they will synthesize a compound of chaining crown ether diaromatic aldehyde thiosemi-carbazone kind.
摘要链状冠醚二芳醛在酸性条件下与氨基硫脲反,
了链状冠醚二芳醛缩氨硫脲类化
物。
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液,采用电位滴定法,连续测定酸性镀铜光充剂中的巯基杂环化物和硫脲衍生物的含量。
Using sodium hydrosulphide or sodium thiosulfate as materials,the production cost of TGA is low.While,a high content of TGA can be obtained with thiourea as reactant.
本文对巯基乙酸的工艺进行了比较研究,认为硫氢化钠法和硫代硫酸钠法生产
本低,适宜于选矿用巯基乙酸的生产,而硫脲法可得到较高浓度的巯基乙酸。
S-Methyl-isothiourea sulfate was oxidized by hydrogen peroxide to give methylsulfonyl chloride in 70% yield in aqueous hydrochloric acid solution.The product was characterized by 1HNNR and IR.
在盐酸介质中,利用双氧水氧化S-甲基异硫脲盐,了甲基磺酰氯,收率70%。
明:以上例句、词性分类均由互联网资源自动生
,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。