单项选择题
In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A.inefficiency
B.oiliness
C.detergency
D.purity
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In general, （） is suitable for delivering small quantities at high pressure.
A.reciprocating pump
B.gear pump
C.centrifugal pump
D.vane pump -
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In four strokes engine, the cycle of events is completed in four strokes of （）.
A.the cylinder
B.the crankshaft
C.the piston
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In each cylinder cover there are two or three holes for （）
A.the exhaust valves
B.the fuel valves
C.indicator cocks
D.the fuel pumps
