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【单选题】
第一种人工开发的塑料——（）出现于1869年，它由硝化纤维素经植物油和樟脑软化制成，是美国人海厄特在寻找材料替代象牙制造台球的过程中发明的。A.
醇溶性树脂
B.
紫胶树脂
C.
赛璐珞
D.
聚氯乙烯
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举一反三
【单选题】认识世界和改造世界的关系不包括
A.
认识世界有助于改造世界
B.
改造世界能够深化和推展对世界的认识
C.
改造世界能够独立于认识世界
D.
认识世界和改造世界是一个矛盾的过程
【简答题】入境报检单的编号栏应由检验检疫机构报检受理人员填写，共l5位，其中第7位为（ ）。
【简答题】Betty is an American. She speaks English. She can also speak a little Chinese. She’s in Beijing now. She’s studying in a primary school(小学) of Beijing. She has classes on weekdays(工作日). On Sundays she...
【简答题】已知有泛型类Box ,下面哪些语句是正确的:A. Box box; B. Box box = null; C. Box box; D. Box box = null;
【简答题】More practice for after- class n cover : 1.They laid him on a stretcher and covered him with a blanket. 2.The bandages were covered in blood. 3.We covered 400km in three hours. 4.Do these parking rest...
【简答题】n cover : 1.They laid him on a stretcher and covered him with a blanket. 2.The bandages were covered in blood. 3.We covered 400km in three hours. 4.Do these parking restrictions cover residents as wel...
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