A water pipe is hollow.
水管是空心
。
A water pipe is hollow.
水管是空心。
The I type shear blocks dowelled bidirectional hollow plates (I SBDBHPs) are the most widely used.
剪力键式双向空心大板中Ⅰ型板（简称Ⅰ型空心大板），是该类空心大板中使用
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.
摘要提出了一种新空心微针阵
工方法，利用三次同步辐射曝光和显影过
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.
介绍了两种大断面空心型材在挤压过中存在问题，阐述了改进挤压模具具体措施和生产时挤压结果.
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