正确答案: B
螺旋桨总平均
题目:螺旋桨各桨叶平均螺距的算术平均值称为()螺距。
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学习资料的答案和解析:
[单选题]船上吊缸检修一般不必进行()。
气缸余隙测量
[单选题]In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the ().
gudgeon pi