When a crankshaft （） outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.<br>A:has to be handled<br>B:may be handled<br>C:has being handled<br>D:will be handling

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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