["건枯燥气密封",,"건枯燥气密封에서 정판과 동판의 하드도가 선택할 때 요구 사항이 있는가? 예를 들어,,"슬롯은 반드시 동판에만 만들 필요는 없다."]
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干气密封在选择动静环材质硬度的时候有没有要求，比如说：必须是动环的材质硬度高于静环或者其他？还有就是一般是不是多选用带螺旋槽的密封块？螺旋槽只能开在动环上吗？求大神给解释解释！！！！！
槽不一定都需要开到动环上
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