单项选择题 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.

单项选择题 When a crankshaft （） outside the engine, it should be carefully supported in a manner which will avoid imposing high bending moments on it.

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