Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge.<br>A:non-pulsating<br>B:pulsating<br>C:positive<br>D:non-positive

Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge.
A:non-pulsating
B:pulsating
C:positive
D:non-positive

出自：海船船员证

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