单项选择题

The most common contaminate of governor hydraulic fluid is （）.

A.moisture
B.dirt
C.acid
D.air

相关考题

The purpose of the safety relief valves installed on an...

单项选择题The purpose of the safety relief valves installed on an auxiliary boiler is to （）.

A.relieve excess fuel oil pressure during the “off” fire cycle
B.admit water to the dry pipe
C.throttle the forced draft fan output for proper combustion
D.reduce excess steam pressure in the boiler

The pH value of water in a diesel engine closed cooling...

单项选择题The pH value of water in a diesel engine closed cooling water system should be maintained between （）.

A.60 to75
B.80 to 95
C.100 to 115
D.120 to 135

Indirect cooling of fuel injector nozzle holders for di...

单项选择题Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.

A.heat conduction into the injected fuel oil
B.heat conduction into the water jacket wall
C.water circulation through passages in the holder
D.fuel oil circulation through passages in the holder

船舶动力装置

The most common contaminate of governor hydraulic fluid is （）.