单项选择题
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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相关考题
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单项选择题
In four strokes engine, the cycle of events is completed in four strokes of （）.
A.the cylinder
B.the crankshaft
C.the piston
D.the cross-head -
单项选择题
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 -
单项选择题
In each cylinder cover is a large central opening for mounting （）
A.the indicating cock
B.the starting valve
C.air inlet valve
D.the exhaust valve
