问题
多项选择题
对单级离心泵消除轴向力的措施有（）。
A、采用双吸式叶轮
B、开平衡孔
C、平衡管
D、叶轮对称布置
答案
参考答案：A, B, C
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对单级离心泵消除轴向力的措施有（）。
A、采用双吸式叶轮
B、开平衡孔
C、平衡管
D、叶轮对称布置
参考答案：A, B, C
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| We are going to take a test today. It will show if we are _1_ to get in an honours class next year. But, I don't think it is _2_ for me. It is the math part-my favorite. We take the test by computer. There _3_ questions for us to do in one hour. The boy behind me _4_ nervous. The girl to my left was nervous, _5_. But, _6_ I began answering the questions, I saw the whole thing _7_ a game. I tried to _8_ easy ways to do the math problems. At the end of the test, my score was 307. But what does it mean? I have no idea. I asked my friend John. He got 227. When he knew my score, he said. "Oh, my God. You're a genius!" So, I asked _9_ people, and got the same answers. Finally, I walked up to Lauren. "David! How did you do on the MAP test?'' I answered, "If I _10_ you, will you kill me?" | ||||
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