考试
2020-03-13 23:52:46

5411 When a crankshaft _____ o

题目描述

When a crankshaft _____ outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.



A.has to be handled

B.may be handled

C.has being handled

D.will be handling

请帮忙给出正确答案和分析,谢谢!

答案解析

题目:When a crankshaft ____

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