A.40%—60% B.40%—80% C.40%—100% D.60%—100%
A.與轉(zhuǎn)速有關(guān),與氣體密度無關(guān) B.與轉(zhuǎn)速無關(guān),與氣體密度有關(guān) C.與轉(zhuǎn)速、氣體密度有關(guān) D.與轉(zhuǎn)速、氣體密度無關(guān)
A.60 B.70 C.90 D.120