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袋型阻尼密封
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袋型阻尼密封
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压气机密封
释
pocket damper seal
袋型阻尼密封
在转动零件和固定零件之间,利用袋型腔室实现泄漏减小的密封结构。
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administrative departments of environmental protection
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administrative fee for river project construction and maintenance
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