A.must be provided
B.may be provided
C.have provided
D.can be provided
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A.has to be cooled
B.has heated
C.has preheated
D.has to be preheated
A.inefficiency
B.oiliness
C.detergency
D.purity
A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump
A.the cylinder
B.the crankshaft
C.the piston
D.the cross-head
A.the exhaust valves
B.the fuel valves
C.indicator cocks
D.the fuel pumps
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What is the function of the thrust bearing?（）
To determine if the lube oil filter elements need changing, （）.
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Lube oil cannot be efficiently filtered if its （）.
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The ability of the governor to prevent fluctuations in engine speed is termed （）.
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Maximum horsepower of a diesel engine is attained （）.
The function of diesel engine piston compression rings is to （）.
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