单选题In a （） the center screw is driven and the outer screws idle.Asingle screw pumpBdouble-screw pumpCtriple screw pumpDcentripetal pump
单选题
In a （） the center screw is driven and the outer screws idle.
A
single screw pump
B
double-screw pump
C
triple screw pump
D
centripetal pump
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