A-A+
When a crankshaft _____ outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.
问题详情
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！
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考点：正确答案
