A.緩沖氣壓力略高于密封段壓力B.緩沖氣壓力略低于密封段壓力C.緩沖氣壓力略高于潤滑油壓力D.潤滑油壓力略高于緩沖氣壓力
A.2.44%B.2.70%C.2.85%D.3.00%
A.780B.800C.900D.1000