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file.yizimg.comfile.yizimg.com/10488/2014091711160743.pdf · pfa astm d 3307 pp gb/t 18742—2002 ptfe hg/t 2902—1997 pvc gb/t 4219— 1996 pvdf astm d 3222 ptfe 2. 20 27—35 >200
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