单项选择题
In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A.improper venting of the cooling system
B.carrying the expansion tank water level too high
C.a totally clogged impeller in the cooling water pump
D.an incorrectly set cooling system temperature control
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A dirty lube oil strainer can result in（）
A.crankcase
B.low lube oil temperature
C.excessive oil consumption
D.low bearing oil pressure -
单项选择题
Differential needle valves used in fuel injectors are directly closed by（）
A.cam action
B.spring force
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单项选择题
In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A.An open vent in the cooling system
B.A fouled sea chest
C.A restricted water passage in the engine
D.Air entrained in the cooling water
