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單項(xiàng)選擇題

There should be a lubricating oil （） between the main beatings and the crankshaft.

A.film
B.cap
C.lacquer
D.shell

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單項(xiàng)選擇題

There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.

A.a gear
B.a cam
C.a rod
D.a miler

單項(xiàng)選擇題

There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

A.recirculating
B.total loss
C.cooling
D.refrigeration

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