单项选择题
A.scale B.sludge C.chemicals D.air
Exhaust temperature increases in all cylinders, the pos...
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)
Excessive clearances in the main or crank-pin bearings ...
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
Engine fuel pump index is （）.A.the viscosity indexB.the...
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
