问题
选择题
| 下列叙述中，正确的是（ ） A．改变反应条件不能改变化学反应的限度 B．延长化学反应的时间能改变化学反应的限度 C．可逆反应达到化学平衡状态时，正反应速率和逆反应速率相等 D．化学平衡状态是一种静止状态，反应物和生成物的浓度不再改变 |
答案
答案：C
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| 下列叙述中，正确的是（ ） A．改变反应条件不能改变化学反应的限度 B．延长化学反应的时间能改变化学反应的限度 C．可逆反应达到化学平衡状态时，正反应速率和逆反应速率相等 D．化学平衡状态是一种静止状态，反应物和生成物的浓度不再改变 |
答案：C
| 短文填空：选择适当的单词填空。 每词限用一次。（有两个多余的选项） | |
China. This is her first time (次数) to China and she 2______ to make some friends there. She meets a Chinese. This Chinese wants to talk 3______ with the American. When he sees her, he comes up, says "4______" to her, then he begins his first talk with someone 5______ an English-speaking country. "How old are you?" the Chinese 6______. "I'm sorry. Please don't ask a lady (女士) about her 7______." answers the woman. The Chinese is surprised. He doesn't know 8______. Can you help him? |