题干

已知 (1)H2(g)+1/2O2(g)=H2O(g)    △H1=a kJ·mol1
(2)2H2(g)+O2(g)=2H2O(g)   △H2=b kJ·mol1
(3)H2(g)+1/2O2(g)=H2O(l)   △H3=c kJ·mol1
(4)2H2(g)+O2(g)=2H2O(l)    △H4=d kJ·mol1
下列关系式中正确的是 

A:a<c<0

B:b>d>0

C:2a=b<0

D:2c=d>0

上一题 下一题 0.0难度 选择题 更新时间:2019-07-05 09:46:21

答案(点此获取答案解析)

C

同类题4

阅读下面的短文,掌握其大意,然后从每小题所给的A、B、C、D四个选项中,选出一个最佳选项。

    When I was a teenager growing up in France, I wanted to leave school and have my own life. The only way I could 1 this was to work in the local paper factory in my town, or get married. I was very nervous when I told my 2  I wanted to leave school. I thought he would say, “No! You are going to college.”I was very 3 when he said, “OK. Let's go to the paper factory.”

    Two days later, he took me to the factory. I imagined everyone to be friends,  4   together and having fun. I even imagined there would be music and singing. I  5  I had watched too many movies as a teenager.

    When we arrived at the factory gate, my father spoke to the guard(门卫) and one minute later we were  6. I walked around the factory looking at the building, the workers and listening to the noise. It was 7. I ran back to my father and said, “I want to go home.”

    He asked me, “What do you think of the factory?”

  “Too bad,” I answered.

  “And marriage is even  8!”he said.

     I went back to school the next day thinking about studying hard  9I could get into a good college. I enjoyed studying English so I decided to major in(主修) languages at college.   

     Thanks to my father and our  10 to the paper factory, I now work at the United Nations and my father is very proud of me. I married a very good man and my life is much better than it would have been working in the factory!