A.泵軸每秒鐘旋轉的次數(shù) B.泵軸每分鐘旋轉的次數(shù) C.葉輪每秒鐘旋轉的次數(shù) D.電機每刻釧施轉的次數(shù)
A.DN40 B.DN20 C.DN32 D.DN50
A.DN25 B.DN20 C.DN32 D.DN50