A.必需汽蝕余量較小 B.較容易實(shí)現(xiàn)自吸 C.適用功率范圍較大 D.效率較高
A.往復(fù)泵 B.離心泵 C.旋渦泵 D.噴射泵
A.低比轉(zhuǎn)數(shù) B.中比轉(zhuǎn)數(shù) C.高比轉(zhuǎn)數(shù) D.不用比轉(zhuǎn)數(shù)概念