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Thermosetting polymers have the distinct advantage of being chemically and thermally resistant materials used in many high-performance applications.()
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Totally elastic deformation occurs very quickly, and the strain is independent of time.()
Polycarbonate has a lower Tg than polyethylene.()
Which one (s) of the following is or are correct?()
对人民币2000元(含)或等值外币以上的现金差错,错款单位根据管辖支行/部门审批意见及时进行处理,并将“中国银行股份有限公司上海市分行现金错款处理审批报告表”报出纳管理部备案。()
Poly(1,4-cis-butadiene) has a higher Tg than Poly(1,4-trans-butadiene) because the cis -form. reduces the energy barrier for rotation of adjacent bonds.()
Fillers are most often added to improve tensile strength, and ().
营业场所严禁吸烟,禁止存放易燃易爆物品。()
Through controlled ving free-radical polymerization (CRP), molecular weight distribution could be narrowed greatly, and PDI could be near to 1.()
Which of following properties are the problem natural rubber in practical application?()
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