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填料密封
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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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plasmonics
plasmonic superlens imaging
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plasmon in solids
plasmon loss peak
plasmon model
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plasmon terahertz modulator
plasmoptysis
plasmotomy
PLA's pressing forward to central China
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