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After the disintegration of the distribution valve, the main body was found face has scratches.
后解体分配阀，发现主阀体工作面已擦伤。
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