单项选择题
A.0.003,0.002B.0.004,0.001C.0.003,0.001
A.流动效率B.泄漏效率C.轮阻效率
A.平前盘B.锥形前盘C.弧形前盘
A.径向叶型B.前向叶型C.后向叶型
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