... bituminous sealn.沥青止水,沥青封缝 non-contact seal非接触式密封 makeinplace sealn.现场浇注密封胶 ...
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non contact seal 非接触式密封
hydrostatic non-contact seal 静压非接触密封
oil film non-contact mechanical seal 油膜非接触式机械密封
non contact type mechanical seal 非接触式机械密封
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