A.a exhaust valve
B.a piston skirt
C.a piston crown
D.an air suction valve
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A.unusually solid welded
B.never be solid forged
C.almost invariably solid forged
D.almost invariably be welded
A.result from
B.result in
C.give out
D.given from
A.make
B.cause
C.result
D.produce
A.boiler
B.heater
C.engine
D.cooler
A.to retain
B.to remain
C.to maintenance
D.to have
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Combustion knock occurring in a diesel engine can be caused by （）.
The minimum speed an engine must attain before ignition can occur depends upon （）.
Proper filtering and straining of fuel oil is important because the （）.
White smoke exhausting from an operating diesel engine may indicate （）.
Routine monitoring of a diesel engine should include （）.
A diesel engine piston ring face is in direct contact with the （）.
In a simple mechanical governor, the （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
Lube oil filters remove contaminants more efficiently if the oil being filtered is （）.
If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.