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问题 单项选择题

在热力学标准条件下，0.100mol的某不饱和烃在一定条件下与0.200gH2发生加成反应生成饱和烃，完全燃烧时生成0.300molCO2气体，则不饱和烃是( )。

A．CH3==CH2
B．CH3CH2CH=CH2
C．CH3CH=CH2
D．CH3CH2C=CH

答案

参考答案：C

解析： 不饱和烃与氢气发生加成反应两者的物质的量之比为1:1，则该不饱和烃中含有一个不饱和烯键，满足CnH2n通式；0.100mol不饱和烃完全燃烧生成0.300molCO2气体说明1分子该不饱和烃含有3个C原子，即n=3。

改错题

I still remember the morning. My father suddenly wake me up at about 5 and the sky was still gray. I jumped out bed surprised and extreme happy, for we were going to get a book! When we drove to the bookstore, many people were already waiting there. We waited for our turn at about 8:30. I was overjoyed when I got a book, not only because of the book themselves, but also of the love from my father. Never before had I felt such a love from him, because of my father, I believed then, had always been busy with his own work. That was “Harry Potter” that helped I feel the deep love from my parents!
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单项选择题

义齿初戴时出现疼痛的原因不包括

A．组织面有塑料小瘤

B．垂直距离过低

C．骨突处缓冲不够

D．基托边缘过长

E．咬合不平衡
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