问题描述：
[单选]
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
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答案解析：无
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上一篇：When a crankshaft has to be handled outside the engine， it should be carefully supported in a manner which will avoid（）high bending moments on it．
下一篇：Vents are led from the engine to the head tank for the release of（）from the cooling water．
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