题目内容

主轴、传动轴、丝杆、衬套等属轴套类零件,主要结构形状为（）。

A. 棱柱体
B. 棱锥体
C. 回转体

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1. (of people or animals, things or actions) apt or ready to attack; offensive

2. a condition where a sense or function is harmed so that it does not work properly

3. scientific study of the structure, function, and diseases of the nervous system.

4. a collection of records or documents