题目内容

简述概貌照相（概览照相）的拍照要求。

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木脚手架横杆有效部分小头直径不得小于（）毫米。

When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housing

A. (1) only
B. (2) only
C. (1) and (2)
D. (1), (2) and (3)

简述运输需求的多样性。

本系统有哪些固体分析？