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單項選擇題

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

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單項選擇題

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

A.piston gudgeon pin
B.piston skirt
C.cross-head
D.cross-head pin

單項選擇題

The loss of （） from an air compressor could lead to an overheated air discharge and possibly an explosion in the pipelines leading to the air reservoir.

A.lubricating oil
B.compressed air
C.cooling water
D.sealing ring

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