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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

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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

單項(xiàng)選擇題

The lower end of each piston rod is reduced in diameter to fit a bore in （）, this being secured to the piston rod by a nut.

A.the crank-web
B.the connecting rod
C.the main bearing
D.the cross-head

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