题目内容

1.溢流节流阀和调速阀相比______。

A. 流量稳定性较好,经济性也较好
B. 流量稳定性较差,经济性也较差
C. 流量稳定性较好,但经济性较差
D. 流量稳定性较差,但经济性较好

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