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.
A.connecting rods B.main bearing C.column D.tie rods
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 （）.
单项选择题 The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.
