单项选择题
A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exposed bronze, the white coloring indicates（）
A.proper break-in wear
B.improper break-in wear
C.relocation of the overlay flashing
D.water contamination of the lube oil system
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If a diesel engine turned over freely but failed to start, the cause could be （）
A.water in the fuel
B.cold lube oil
C.excessive starting air pressure
D.excessive fuel pressure -
单项选择题
If it becomes necessary to cutout an individual cylinder of a large, low-speed, main propulsion diesel engine, the fuel to that cylinder should be secured and its （）
A.fuel pump should be removed and all connections blanked off
B.cylinder oil feed rate should be increased slightly above that used at normal sea speed
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D.cylinder oil feed rate should be increased to the maximum flow capable of the metering pump -
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The satisfactory operation of diesel engine exhaust valves usually depends on（）
A.the proper back pressure
B.the cooling water temperature
C.correct timing and proper seating
D.accurate metering and the exhaust temperature
