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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单项选择题

A.the cylinder
B.the crankshaft
C.the piston
D.the cross-head

单项选择题

A.the exhaust valves
B.the fuel valves
C.indicator cocks
D.the fuel pumps

单项选择题

A.the indicating cock
B.the starting valve
C.air inlet valve
D.the exhaust valve