单项选择题
A.make the engine stop
B.regulate the timing of camshafts
C.make the rpm stabilize at any required value
D.make the engine run at nearly constant speed
单项选择题 The gas loads on the engine structure are constrained by means of hydraulically preloaded （） which connect the bed plate, frame sections and cylinder jackets into a single unit.
单项选择题 The function of a lubricating oil is （） to lubricate the running surface （） to carry away a great deal of heat.
单项选择题 The fuel pipes and ducts should be blown with （）.