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

职业资格 公共英语 已帮助 人

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!

热搜:关于氨基酸代谢错误的论述是_________。