單項(xiàng)選擇題The engine may lose power or slow down during running, when this occurs, the first cause possible may be hot bearings and （） of the pistons in the cylinders.

A.crack
B.knocking
C.leaking
D.seizure


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1.單項(xiàng)選擇題The engine is started with （） supplied from air receivers.

A.pressure oil
B.pressure water
C.compressed air
D.cooling water

3.單項(xiàng)選擇題The engine has one or two group of fuel pumps, depending upon （）.

A.the number of fuel valves
B.the number of cylinders
C.the speed of engine
D.the power of engine

4.單項(xiàng)選擇題The energy for pushing this piston up can be supplied from （）, so that the piston can keep moving up and down.

A.the same piston
B.the piston nearby
C.the other pistons
D.the generators on board