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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The function of diesel engine piston compression rings is to （）.
Which of the two events listed occurs simultaneously in a two-stroke/cycle diesel engine?（）
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What is the function of the thrust bearing?（）
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An automated diesel engine should normally shut down due to （）
Combustion knock can occur in the cylinders of a diesel engine under any condition permitting （）.