• 2022-06-03
    刃边密封的动环密封面很窄,仅(),而且平衡比()
    A: b=0.15~0.25;B=0~0.25
    B: b=0.25~0.5;B=0~0.25
    C: b=0.15~0.25;B=0~0.5
    D: b=0.25~0.5;B=0~0.5