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


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1.單項(xiàng)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

3.單項(xiàng)選擇題The joint face between the cylinder cover and the liner is arranged （）the combustion process as possible.

A.such far away from
B.such near by
C.as far away from
D.as near by

4.單項(xiàng)選擇題The interface between the liquid seal (water) and the oil should be positioned （） possible to the bowl periphery.

A.as far as
B.as soon as
C.as close as
D.as closer as

5.單項(xiàng)選擇題The inner part of the condenser should be cleaned with （）.

A.gas oil
B.diesel oil
C.chemical compound
D.Freon-12