A water pipe is hollow.
水管是
。
A water pipe is hollow.
水管是。
The I type shear blocks dowelled bidirectional hollow plates (I SBDBHPs) are the most widely used.
剪力键式双向大板中Ⅰ型板（简称Ⅰ型大板），是该类大板中使用最多一种板型。
A new fabrication method for hollow microneedle array is proposed with three times exposures in deep X-ray lithography of synchrotron radiation and the development procedure.
摘要提出了一种新微针阵
加工方法，利用三次同步辐射曝光和显影过程来加工微针。
The problems existed in extrusion process of two sorts large section hollow extrusion profilesare introduced. The concrete measure and extrusion consequence of the improved prothole die are given.
介绍了两种大断面型材在
过程中存在问题，阐述了改
模具具体措施和生产时结果.
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