在常温下，把一个盛有一定量甲烷和氯气的密闭玻璃容器放在光亮的_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

在常温下，把一个盛有一定量甲烷和氯气的密闭玻璃容器放在光亮的地方，两种气体发生反应，下列叙述不正确的是

A．容器内压强不变

B．容器内分子总数不变

C．容器内原子总数不变

D．容器内发生的反应是取代反应

答案

答案：A

题目分析：甲烷与氯气反应产物为氯代甲烷和HCl，反应后原子总数不变，分子总数也不变，但是由于CCl4是液态，故气体的物质的量减小，反应后压强减小，该反应为取代反应。

填空题

根据句意, 用括号内所给动词的适当形式填空. (必要时加助动词或情态动词)

1. Mr Zhang ______ (teach) us English three years ago.

2. Peter turned off the computer after he finished ______ (write) an e-mail.

3. —Where's Miss Wang?

—Look, she ______ (talk) with the students.

4. Mr Liu isn't here now．He ______ (go) to Beijing.

5. The children will go to the zoo if it ______ (not rain) this Saturday.

6. There ______ (be) a meeting in our school tomorrow afternoon.

7. Mr Green ______(watch) TV at this time last night.

8. You'd better ______ (eat) less food before you go to bed.

9. My teacher told me that light ______ (travel) much faster than sound.

10. English ______ (speak) by many people in the world.

单项选择题

预防创伤性气性坏疽发病最可靠方法是( )。

A．彻底清创
B．应用抗毒素
C．应用甲硝唑
D．应用青霉素
E．高压氧治疗