单项选择题
Since the engine doesn’t work well, you’d better （） as soon as possible.
A.reduce its speed B.find out its trouble C.eliminate its trouble D.all the above
单项选择题 （）, so they are widely used on board ship nowadays.
单项选择题 The quality of the fuel oil and lube oil （）, Im afraid.
单项选择题 The fuel injection system is very important, so any trouble of it will （） the operation of the main engine.
