漩涡泵的叶轮与离心式叶轮不同，是离心漩涡泵的（）。
A.增压元件
B.减压元件
C.重要部件
D.动力元件
参考答案：A
--Where have you been?
--I in the heavy traffic. Otherwise I here earlier.
A．got stuck; would have come
B．got stuck; was
C．have got stuck; would have come
D．had got stuck; would come
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