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填料密封
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往复密封
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packing box seal
填料密封
通过填料阻塞泄漏通路实现往复或旋转相对运动界面的密封。又称压紧填料密封。
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Pre-Hispanic City of Chichen-Itza
Pre-Hispanic City of Teotihuacan
prehistoric archaeology
Prehistoric Art
prehistoric art design
prehistoric astronomy
prehistoric cities in the Chengdu Plain
Prehistoric Cultures in Central and South Africa
Prehistoric Cultures in Indonesia
Prehistoric Cultures in the Philippines
Prehistoric lakeshore wooden pile buildings in the Alps
prehistoric man-environment relationship
prehistoric media
prehistory
prehnite
prehnite-pumphyllite facies
prehomogeneous space
prehomogeneous vector space
prehospital emergency medical care
prehypertensive
preignite
preignition
preimage
preimage of an element
preimage of a set
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