單項選擇題刃邊密封的動環(huán)密封面很窄,僅(),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


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