如果泵的实际流量和扬程需要小于铭牌扬程和流量时,可以采取()的方法。
A.增大叶轮直径
B.切削叶轮
C.关小进口阀
D.提高转速
参考答案:B
连词成句。
1. do, home, you, How, go (?)
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2. go, You, plane, by, can (.)
3. I, the, playing, like, violin (.)
4. a, Is, writer, She (.)
述离心泵的开停车操作?