單項(xiàng)選擇題

Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.

A.fuel/water separators
B.day tanks
C.injector test stand
D.fuel filters

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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

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