问题
选择题
一定温度下的反应A(g)+3B(g)
2C(g)，下列叙述不能表明它达到化学平衡的是 [ ]
A．A、B、C的浓度不再变化
B．混合气体的总物质的量不再变化
C．单位时间内a mol A生成，同时生成3a mol B
D．C的生成速率与C的分解速率相等
答案
答案：C
搜题请搜索小程序“爱下问搜题”
一定温度下的反应A(g)+3B(g)2C(g)，下列叙述不能表明它达到化学平衡的是 [ ]
A．A、B、C的浓度不再变化
B．混合气体的总物质的量不再变化
C．单位时间内a mol A生成，同时生成3a mol B
D．C的生成速率与C的分解速率相等
答案：C
| 任务型阅读：根据短文内容，将方框中的句子回填到短文中适当的位置。 | |
| Breakfast is the most important meal of the day! 1 You need some food to give you energy for the whole day. Any breakfast is better than no breakfast, but it's not a good idea to eat sweet food for breakfast all the time. 2 Try different kinds of foods: bread, cereal,meat, fruit, vegetables, eggs,milk… Some students don't eat breakfast because they get up late or because they think it's a good way to lose weight. 3 If you don't eat breakfast, you may feel tired when you're in class. 4 Next time if you get up late, don't forget to take some breakfast with you. Also, people who don't eat breakfast may eat more food during the day. 5 People should have a good breakfast to work well during the day.
|