题目内容

可使任何反应达到平衡时增加产率的措施是

A. 升高温度
B. 增大压力
C. 增加反应物浓度
D. 加入催化剂

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500 K时，反应 SO2 (g) ＋ 0.5O2 (g) ＝SO3 (g) 的 KΘ ＝ 50 ，在相同温度下，反应2 SO3(g)＝2 SO2 (g) ＋ O2 (g) 的 KΘ为

A. 100
B. 2×10－2
C. 2500
D. 4×10－4

Ann: Hello, Susan. Can I see you after work this week?Susan: Hello, Ann. It would be nice to see you again, but I’m quite busy this week. This afternoon I’m havinga meeting at 5.Ann: Don’t you have time tomorrow?Susan: Tomorrow is Tuesday. I’ve got to have dinner with some friends.Ann: That’s a pity. What about Wednesday?Susan: Wednesday is difficult as well. I’ve got an appointment with Mr. Peterson.Ann: Thursday then?Susan: No, Thursday is out for me, I’m afraid. I’ve got to stay in my office and do some extra work. I really must.Ann: Oh, that’s a shame. Well, I know you’ve got to go to the evening classes each Friday.Susan: That’s right. I’m sorry I can’t manage this week.Ann: It looks as if we’ll have to wait until next week then.Susan: Yes. Look, I must go now. I’ve got to meet Jack in ten minutes. Would you please give me a call next week?

在画放大电路的直流通路时，电容可以看成（），电感可以看成（）。

A. 短路，开路
B. 短路，短路
C. 开路，短路
D. 开路，开路

在画放大电路交流通路的时候，电容可以看成（），直流电源可以看成（）。

A. 短路，短路
B. 短路，开路
C. 开路，短路
D. 开路，开路