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單項(xiàng)選擇題

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.

A.compressing
B.interposing
C.imposing
D.pounding

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Vents are led from the engine to the head tank for the release of （） from the cooling water.

A.air
B.heat
C.sludge
D.steam