單項(xiàng)選擇題

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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單項(xiàng)選擇題

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
D.not only；but also

單項(xiàng)選擇題

The fuel pipes and ducts should be blown with （）.

A.atmosphere
B.the fresh water
C.compressed air
D.chemical compounds