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【简答题】
以乙炔为主要原料可合成聚氯乙烯等，其制备过程如下 (1)试写出B和C的结构：B____________，C___________ (2)写出反应③和反应⑦的化学方程式并指明反应类型： ③____________________；________ ⑦____________________；________ (3)若某聚丙烯腈的平均相对分子质量为26500，则n=_______ (4)三分子乙炔在一定条件下可聚合成环状分子，该分子的结构可表示为_______________。
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参考答案：
举一反三
【单选题】2018年世界杯决赛比分是多少?
A.
4：1，法国：克罗地亚
B.
4：2，法国：克罗地亚
C.
3：1，法国：克罗地亚
D.
 3：2，法国：克罗地亚
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【单选题】What did Jonathan do when the burglar attempted to escape from the window?
A.
He called the police by shouting at the top of his voice.
B.
He immediately locked the door and rushed to the police station.
C.
He hit the burglar with the point of his umbrella.
D.
He had expected that the burglar would hit him.
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【单选题】. The prisoner _____ to escape from the prison. But he couldn’t find anybody to help him.
A.
attempted
B.
managed
C.
advised
D.
offered
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【简答题】['wɜːkʃɒp] ________________________________
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【判断题】道路运输站(场)经营者应当对出站的车辆进行安全检查,禁止无证经营的车辆进站从事经营活动,防止超载车辆或者未经安全检查的车辆出站。
A.
正确
B.
错误
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【单选题】Anyone in my position would have been ruined if he had attempted to ________ depths which not even a lifetime of study could plumb (探索)． [     ]
A.
dive into
B.
look up
C.
agree on
D.
date back
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【简答题】He attempted _______ to set up a company of his own. A. with vain B. on vain C. in vain D. of vain
查看完整题目与答案
【单选题】He attempted _____ the exam in this term.
A.
passing
B.
pass
C.
to pass
D.
in passing
查看完整题目与答案
【判断题】西方经济学可以较好的解释中国的经济现状。()
A.
正确
B.
错误
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【单选题】()可以较好地解释中国的经济现状。
A.
马克思主义政治经济学
B.
西方经济学
C.
欧洲经济学
D.
社会主义经济学
查看完整题目与答案
相关题目：
【单选题】2018年世界杯决赛比分是多少?
A.
4：1，法国：克罗地亚
B.
4：2，法国：克罗地亚
C.
3：1，法国：克罗地亚
D.
 3：2，法国：克罗地亚
查看完整题目与答案
【单选题】What did Jonathan do when the burglar attempted to escape from the window?
A.
He called the police by shouting at the top of his voice.
B.
He immediately locked the door and rushed to the police station.
C.
He hit the burglar with the point of his umbrella.
D.
He had expected that the burglar would hit him.
查看完整题目与答案
【单选题】. The prisoner _____ to escape from the prison. But he couldn’t find anybody to help him.
A.
attempted
B.
managed
C.
advised
D.
offered
查看完整题目与答案
【简答题】['wɜːkʃɒp] ________________________________
查看完整题目与答案
【判断题】道路运输站(场)经营者应当对出站的车辆进行安全检查,禁止无证经营的车辆进站从事经营活动,防止超载车辆或者未经安全检查的车辆出站。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Anyone in my position would have been ruined if he had attempted to ________ depths which not even a lifetime of study could plumb (探索)． [     ]
A.
dive into
B.
look up
C.
agree on
D.
date back
查看完整题目与答案
【简答题】He attempted _______ to set up a company of his own. A. with vain B. on vain C. in vain D. of vain
查看完整题目与答案
【单选题】He attempted _____ the exam in this term.
A.
passing
B.
pass
C.
to pass
D.
in passing
查看完整题目与答案
【判断题】西方经济学可以较好的解释中国的经济现状。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】()可以较好地解释中国的经济现状。
A.
马克思主义政治经济学
B.
西方经济学
C.
欧洲经济学
D.
社会主义经济学
查看完整题目与答案
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