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haitao2012銅蟲 (小有名氣)
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[交流]
這些描述是什么意思?
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The composition is 77% aliphatic, polyether-based polyurethane with 20% water uptake, 17% aliphatic, polyether-based polyurethane with 60% water uptake, and 6% aliphatic, polyether-based polyurethane with 3% water uptake. 上面描述的三種物質(zhì)是什么?西格瑪公司可以買到,還是需要自己合成? |
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