In general, （） is suitable for delivering small quantities

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[单选题]In general, （） is suitable for delivering small quantities at high pressure.

A. reciprocating pump
B. gear pump
C. centrifugal pump
D. vane pum

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[单选题]If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

A. 525 RPM
B. 775 RPM
C. 1550 RPM
D. 1800 RPM

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