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Thus, piston rings must be used to provide the necessary seal.
所以活塞环就用来提供必要的密封。
youdao
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Major production and distribution piston rings and valve seat.
主要生产和经销活塞环及气门座圈。
youdao
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Major production and distribution piston rings and valve seat.
主要生产和经销活塞环及气门座圈。
youdao