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单选题
Starting air valves are held firmly on their seats by（）
A
cam rollers on the camshaft
B
spring force
C
air pressure on top of the valve differential piston
D
air pressure on the bottom of the valve differential piston
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to increaseB
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main start valve closedC
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A and B
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cylinder compression pressureC
starting air pressureD
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单选题The pressure of pilot air is usually （） than that of starting air.A
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keep the valves off their seats until the exhaust stroke is completedC
close the valvesD
open inlet valves when the air injection cycle begins
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overhaulB
runningC
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单选题（） supplies pilot air to control the cylinder air start valves.A
An air compressorB
An indicator cockC
An air distributorD
A safety valve
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单选题After finished the engine, which of valves cannot be shut off by the duty engineer?（）A
fuel valveB
the starting air valveC
the sea chestD
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closeC
drainD
vent
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water accumulation in some engine cylindersC
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leaky discharge valves on the HP cylinderC
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