An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.<br>A:maintaining a steadier speed<br>B:delivering liquids over greater distances<br>C:operating for longer periods of time<br>D:producing a smoother discharge flow

An advantage of a helical gear pump over a simple gear pump is that the helical gear pump is capable of （）.
A:maintaining a steadier speed
B:delivering liquids over greater distances
C:operating for longer periods of time
D:producing a smoother discharge flow

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