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單項(xiàng)選擇題

Lubricating oil should be changed on a heavy duty diesel engine when（）.

A.it gets dark in color
B.a sample rubbed between fingers feels thin
C.it has been in use for a specified interval
D.it no longer supports combustion

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單項(xiàng)選擇題

If your propeller is racing in rough weather，you should（）.

A.decrease your engine speed
B.ignore it
C.increase your engine speed
D.stop your engine until the rough weather passes

單項(xiàng)選擇題

If you are unable to stop a diesel engine by any other means，you should（）.

A.discharge a CO₂ extinguisher in the air inlet
B.pull off the distributor cap
C.secure the jacket water
D.secure the starting air supply valve