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
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The function of a lubricating oil is （） to lubricate the running surface （） to carry away a great deal of heat.
A.not；but
B.neither；nor
C.either；or
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The fuel pipes and ducts should be blown with （）.
A.atmosphere
B.the fresh water
C.compressed air
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The fuel oil system for a diesel engine can be considered in two parts--the fuel supply and the （） systems.
A.fuel treatment
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