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【判断题】
问:正丁醇 (CH 3 CH 2 CH 2 CH 2 OH) 的沸点 (117°C ) 比它的同分异构体乙醚 (CH 3 CH 2 OCH 2 CH 3 ) 的沸点 (34.5°C ) 高得多,但两者在水中的溶解度均为 8g/100g 水,试解释之。 解: 正丁醇分子之间可以形成分子间氢键,而乙醚分子之间不能形成氢键,所以正丁醇的的沸点远高于乙醚。 但二者均可水分子形成氢键,所以它们在水中都有一定的溶解度 (8g/100g 水 ) 。 评:这个解释合情合理!A.
正确
B.
错误
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【单选题】After he became conscious, he remembered _________ and _________ on the head with a rod.
A.
to attack; hit
B.
to be attacked; to be hit
C.
attacking; be hit
D.
having been attacked; hit
【简答题】阅读理解。 Feel tired lately? Has a doctor said he can't find anything wrong with you? Perhaps he has sent you to a hospital, but all the advanced equipment there shows that there is nothing wrong with you...
【单选题】There are fewer voice calls in New York in the days after the attack.
A.
Y
B.
N
C.
NG
【简答题】颅内压增高的典型表现称为颅内压增高三主征,包括:___ 、 ___、___。
【简答题】According to a 2008 study, the reason why the heart attack risks in Sweden increased after the spring time change was most probably___________.
【简答题】The US government's attack on Afghanistan, after September 11 ，according to its "rights of self-defense"．
【简答题】简述小细胞肺癌的治疗原则
【简答题】简述肺癌的治疗原则?
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