A.aluminum-plated
B.bronze-plated
C.zinc-plated
D.chromium-plated
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A.must be provided
B.may be provided
C.have provided
D.can be provided
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
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The minimum speed an engine must attain before ignition can occur depends upon （）.
If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.
What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）
The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing workThis is known as （）.
To determine if the lube oil filter elements need changing, （）.
Maximum horsepower of a diesel engine is attained （）.
Routine monitoring of a diesel engine should include （）.
In using reduction gears to obtain efficient propeller speeds, （）.
When fuel oil has seriously contaminated a diesel engine lubricating oil, you should （）.
A diesel engine piston ring face is in direct contact with the （）.