题目内容

用渐开线齿形检查仪测量渐开线齿形误差,常用的是绝对测量法。

A. 正确
B. 错误

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在马斯洛的人类基本需要层次论中,安全的需要是第二层次的需要

A. 正确
B. 错误

开车前应按《选煤厂机电设备检查细则》要求,对设备进行()。

Your vessel is equipped with a fixed C02 system and a fire main system. In the event of an electrical fire in the engine room what is the correct procedure for fighting the fire?().

A. Use the C02 system and evacuate the engine room
B. Use the fire main system and evacuate the engine room
C. Evacuate the engine room and use the C02 system
D. Evacuate the engine room and use the fire main system

世界第四大粮食作物是()

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