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A seal assembly for use with a rotating shaft.
一种用于旋转轴的密封组件。
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A polished rod seal assembly with new structure is introduced.
介绍了一种新型结构的光杆密封盒。
The seal assembly comprises a seal ring, a seal ring shell and bellows.
密封组件包括密封环、密封环壳体和波纹管。
The Queen will officially approve the new Welsh Seal, to be affixed to all new pieces of Assembly legislation.
BBC: Preparing for the crunch ahead
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