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單項(xiàng)選擇題

The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known as （）.

A.mechanical lubricator
B.lubrication function
C.forced feed system
D.bearing lubrication

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單項(xiàng)選擇題

The cleaned heated oil, after passing through the centrifuges, is to be pumped to a （）.

A.settling tank
B.service tank
C.ballast tank
D.drain tank

單項(xiàng)選擇題

The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.

A.the connecting rod
B.the cross-head
C.the piston rod
D.the air box