ASTM D3035-2008 以受控外径为基准的聚乙烯(PE)塑料管(DR-PR)的标准规范 ASTM 美国材料与试验协会 协会标准...
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DR PR 有用率
PR DR 重氮树脂
The person having a busy day wasn't the middle-aged Dr. Schwartz, but an alluring 26-year-old PR whiz, Christina Salgado, who posts six tweets a day to Schwartz's page.
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