A.15B.10C.4~7D.2
A.機(jī)械能轉(zhuǎn)變成液體的壓力勢(shì)能B.壓力勢(shì)能轉(zhuǎn)變成機(jī)械能C.機(jī)械能轉(zhuǎn)變成動(dòng)能
A.100%B.80%C.40~60%D.20%