A.0~24 B.08~08 C.12~12 D.20~20
A.轉(zhuǎn)速 B.水力螺距 C.摩阻常數(shù) D.測(cè)速歷時(shí)
A.0.2h.0.6h.0.8h B.0.2h.0.4h.0.8h C.0.4h.0.6h.0.8h D.0.2h.0.4h.0.6h