在X6132型卧式万能铣床上用盘形铣刀铣削梯形等高齿离合器时，分度头主轴应()
A. 仰起一个角
B. 与工作台平行
C. 与工作台垂直
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最主要的治疗原则为
A. 使用足量广谱抗生素
B. 给予缩宫素
C. 支持疗法
D. 中药治疗
E. 立即行刮宫术
You are on a large merchant vessel entering a port.There is a Pilot on board and he has the conn.Which statement is TRUE ________.
A. The Master is responsible for the safe navigation of the ship and the Pilot is employed for his local knowledge
B. The Pilot is solely responsible for the safe maneuvering of the ship only if he is required to be on board by law
C. The Pilot is solely responsible for the internal working of the ship
D. The Pilot becomes solely responsible for the safe navigation of the vessel only if the Master relinquishes the conn
步进电机采用三相六拍的通电方式，此时的步距角为30度()
难加工材料主要是指切削加工性差的材料，不一定简单地从力学性能上来区分。如在难加工材料中，有硬度高的，也有硬度低的。()
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