题目内容

英制螺纹的牙形角为()。

A. 60°
B. 55°
C. 50°
D. 45°。

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Some medium and high-speed diesel engines require reduction gear units to provide a useful

A. must churn the oil in the sump
B. is connected to the propeller shaft
C. is driven at the highest RPM
D. compensates for alignment variations between the engine and pinion gear

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