The pilot lost contact with the military base, ___ the plane crashed in the desert. A. by means of which B. for which C. among which D. as a result of which
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参考答案:
举一反三
【单选题】从离心泵 Q-N 曲线上可看出,在 Q=0 时, N ≠ 0, 这部分功率将消耗在水泵的机械损失中,变为( )而消耗掉,其结果将使泵壳内水温上升,泵壳、轴承会发热,而严重时会导致泵壳变变型。所以,起动后出水阀门不能关太久。