台湾省的经济特点是（ ）

氮可形成多种气态氧化物，如NO、NO₂、N₂O₄等．已知NO₂和N₂O₄的结构式分别是．实验测得N﹣N键的键能为167kJ•mol^﹣1，NO₂中氮氧键的键能为 466kJ•mol^﹣1，N₂O₄中氮氧键的键能为438.5kJ•mol^﹣1．

（1）写出N₂O₄转化NO₂为的热化学方程式____ ．

（2）对反应N₂O₄（g）⇌2NO₂（g），在温度T₁、T₂时，平衡体系中NO₂的体积分数随压强变化曲线如图所示．

①A、C两点的反应速率v（A）____ v（C）（填“＞”“=”或“＜”）．

②B、C两点的气体平均相对分子质量M（B）____ M（C）（填“＞”、“=”或“＜”）．

③由状态B到达状态A可用的方法是____ ．

④A点气体的颜色比C点____ （填“深”、“浅”或“相同”），原因是____ ．

（3）在100℃时，将0.40mol的NO₂气体充入2L的密闭容器中，每隔一定时间就对该容器内的物质进行分析，得到下表所示数据．

①在上述条件下，从反应开始直至20s时，v（NO₂）=____ mol•L^﹣1•s^﹣1．

②若在相同的情况下最初向该容器充入的是N₂O₄气体，要达到上述同样的平衡状态，N₂O₄的起始浓度应是____ mol•L^﹣1．

    When we talk about our grandparents, the first word we can remember is "old". Super Grandmother and Super Grandfather contest (比赛) gives old people a chance to show their talents to us. What is this contest like?

    Every year, people aged over seventy, from all over Georgia, come to Tbilisi to take part in Super Grandmother and Super Grandfather contest. Some play the piano, some dance, some sing and some perform plays. Although they are very old, they perform very carefully. In fact, some of their programmes are good and they are even invited to television shows.

    In this year's contest, 80-year- old Tsuri Kakabadze got the title of "Super Grandmother" because she had a beautiful voice. And 77-year-old Yuri Merabov got the title of "Super Grandfather" because he played the piano well.

    But the results do not really matter. These old people just come to have some fun. I hope this kind of contest should be all over world. Don't you?