单项选择题
Expansion tank should be used to remove （） from cooling water.
A.scale
B.sludge
C.chemicals
D.air
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相关考题
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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) -
单项选择题
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 -
单项选择题
Engine fuel pump index is （）.
A.the viscosity index
B.the fuel oil contents
C.the starting speed
D.the reading at the rack
