單項(xiàng)選擇題

The lube oil in the bearings is drawn from a （）, usually located in the bedplate.

A.tank
B.sump
C.vessel
D.bottle

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單項(xiàng)選擇題

The lowest ring of a piston is （）.

A.a coil spring
B.a sealing ring
C.an oil distributor ring
D.main seal ring

單項(xiàng)選擇題

The lower end of each piston rod is reduced in diameter to fit a bore in （）.

A.the crosshead
B.the journals of the crosshead
C.the crosshead shoes
D.the guides