单项选择题

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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单项选择题

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

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

单项选择题

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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Excessive clearances in the main or crank-pin bearings will sometimes be indicated by （） before any bearing knock is heard.

A.loss of flow in the fuel system
B.loss of pressure in the air system
C.loss of flow in the lubricating system
D.loss of pressure in the lubricating system