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單項選擇題

Failure of fuel injection is usually due to trouble in the （）.

A.exhaust valves
B.mechanical lubricators
C.cooling water pumps
D.fuel injection pumps

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單項選擇題

Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.

A.throughput
B.back pressure
C.gravity disc
D.None of the above is wrong

單項選擇題

Expansion tank should be used to remove （） from cooling water.

A.scale
B.sludge
C.chemicals
D.air