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问题详情

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

时间：2022-01-01 05:45 关键词：船舶辅助机械

答案解析

D

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