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【单选题】
请指出下列说法中正确的说法：A.
涡轮机方程式仅适用于涡轮机，即输出功的机械；
B.
涡轮机方程式既适用于输出功的机械(T s ＜0)，也适用于吸收功的机械(T s ＞0，如泵类)；
C.
涡轮机方程式仅适用于不可压缩流动。
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