(1)某温度下,2L恒容密闭容器中,X、Y、Z三种气体发生化学反应时,物质的量随时间变化的关系曲线如图所示,则
①反应的化学方程式为____ ;
②0~10s内,用Z表示的化学反应速率____ ;
③X的转化率为____ ;
(2)已知I2(g)为紫红色,在恒容容器中,可逆反应H2(g)+I2(g)⇌2HI(g)达到平衡的标志是____
A.混合气体密度恒定不变 B.混合气体的颜色不再改变
C.H2、I2、HI的浓度相等 D.混合气体的压强不再改变.
下列有关对自行车的做法不合理的是( )
一个正点电荷的电场线分布如图所示,A、B是电场中的两点,A点距离正点电荷较近,用EA和EB分别表示A、B两点电场强度的大小,φA和φB分别表示A、B两点的电势,则EA和EB的大小关系是EA____EB,φA和φB的高低关系是φA____φB.
根据上面内容判断正误,正确的写(T),错误的写(F). There are many clubs in our school. Let me tell you what they are. Do you like playing tennis? It's OK if you can't play tennis. Mr. Qing can teach you. Come and join the tennis club!Do you like acting? Do you like to work with other young people? Do you want to be in the school play? Come and join the acting club.Can you dance? Do you like Latin (拉丁) dance or Chinese traditional (传统的) dance? Join the dance club and dance for the Christmas (圣诞节) show. Do you like French food? Can you speak French? Do you want to learn French? Join the French club now.____ Mr. Qing can teach you French.____ If you join the acting club, you can act in the school play.____ Christmas Day is coming.____ You can learn French in the French club.____ There are three clubs in the school.
目前,北京正在朝着“国家首都、世界城市、文化名城、____”的目标迈进.
扩句。
①司马迁写史记。
②司马迁打消念头。