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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

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單項選擇題

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

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

單項選擇題

Exhaust temperature increases in all cylinders, the possible cause may be（）
(1) increased scavenging air temperature
(2) air in fuel pumps and fuel valves
(3) fouling of air and gas passages

A.(1)+(2)
B.(1)+(3)
C.(2)+(3)
D.(1)+(2)+(3)

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