单选题Centrifugal pumps are popular because they are very simple in construction,and produce smooth, constant, （） discharge.Anon-pulsatingBpulsatingCpositiveDnon-positive
单选题
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
参考解析
解析：
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