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After vulcanization, there are still many carbon-carbon double bonds in the molecular chains of natural rubber.()
此题为判断题(对,错)。
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Thermoplastics are mainly prepared by addition polymerization.()
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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.()
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