单项选择题
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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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
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
