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单选题
In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.
A
lube oil pump suction line
B
lube oil pump discharge line
C
bottom of the lube oil sump
D
outlet from the lube oil header
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principalC
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单选题Diesel engine cylinder head test cocks are used to（）A
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考题
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单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
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考题
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cetane numberB
pour pointC
viscosity temperatureD
quality of the oil
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a cooling systemB
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an injection system
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单选题The diesel engine is a type of （）.A
turbine engineB
gas turbineC
steam engineD
internal combustion engine
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