Aluminium foil bellows, raws li feem ntau siv cov ntaub ntawv rwb thaiv tsev rau cov tsheb thaiv tsheb, yog tsim los tiv thaiv cov hlua khi hauv lub tsheb los ntawm yam xws li kub, compression, khoov, tshuaj yaig, thiab dej nkag.Cov laj thawj tseem ceeb vim li cas txhua lub tsheb muaj qhov no ...
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