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【简答题】
根据以下单溴代反应的事实，推测相对分子质量为72的烷烃异构体的构造。(1)只生成一种溴代产物；(2)生成三种溴代产物；(3)生成四种溴代产物。
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【简答题】证明对象有哪些特征?
【判断题】Once you have learned the basics of the English language, you may think that’s all there is to it, but most Americans speak yet another language. 译文:一旦你了解了基础英语,可能会认为这就是全部,但大多数美国人却讲的是另一种语言。
A.
正确
B.
错误
【简答题】测试设计员的职责有:( )1制定测试计划 2设计测试用例 3设计测试过程、脚本 4评估测试活动A. ①和② B. ① ②和③ C. ②和③ D. ① ② ③和④与爱情
【单选题】B The world is not only hungry，it is also thirsty for water． this may seem strange to you，since nearly 75% of the earth is covered with water． But about 97% of this water is sea water．Man can only dri...
A.
The amount of fresh water is really very small．
B.
The people of the world waste too much water．
C.
The people of the world have to drink a lot of water every day．
D.
There are too many people in the world needing water．
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