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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

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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 （）, 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

單項(xiàng)選擇題

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

A.a bolt
B.a cap
C.a disc
D.a nut