（） in what position the engine stops there will always be at least one of the cylinders with its starting air valve open to admit compressed air to start the engine.

（） for the camshaft gear train is taken from a spur gea...

单项选择题（） for the camshaft gear train is taken from a spur gear which for a six cylinder engine is at the coupling end.

（） water is more expensive than fresh water It has high...

单项选择题（） water is more expensive than fresh water It has high specific heat and low viscosity.

（） the engines, the diesel engine is（） used engine on b...

单项选择题（） the engines, the diesel engine is（） used engine on board.