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【单选题】
离心泵内的导叶轮的主要作用是（ ）。A.
调整叶轮转速
B.
防止发生气缚
C.
降低液体由叶轮外缘进入泵壳时的机械能损失
D.
防止发生漏气
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【单选题】According to the Science magazine, compared with people reading literary fiction, those reading nonfiction______.
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