奥氏体不锈钢卷出退火炉后不应快速冷却。

在实验室中制取二氧化碳．下列有关该实验的说法中，正确的是（　　）

A．用排水法收集一瓶二氧化碳气体

B．先往试管中放入石灰石，再滴入稀硫酸

C．将燃烧的木条伸入集气瓶中，检验二氧化碳是否集满

D．将集满二氧化碳气体的集气瓶盖上玻璃片，正放在桌上

单词拼写,按照提示写出单词的正确形式.

1. He looks handsome and gentle, but ______ __(事实上) he is a thief.

2. Judging from his           (口音) he must be from Shanghai.

3. A flash of bright            (闪电)was followed by loud thunder.

4. Of the two choices , I prefer the _________ (后者).

5. He completely _________(忽视) all these facts as if they didn't exsit.

6. I can speak English ________(流利地).

7.The firemen___________(营救)three women from the burning house

8. After the battle they b________ the dead.

9. His mother tongue is German, but he speaks Italian like a         (本国人)

10.Though I haven't met him for many years, I could ________(认出)him immediately when I

    saw him in the crowd.

11.He didn't stop in Hong Kong and flew        (直接) to London.

12.He used to do some_________(户外) activities even in the middle of winter.

13. The city was completely________ (破坏)by the earthquake.

14. After graduation,she__________ (定居)in Canada.

15. Then  _______________(渐渐地)English became less like German.

Sometimes we _____ be busy shopping in a supermarket, for it's more convenient to purchase online nowadays. [ ]

A. needn't

B. mustn't

C. shouldn't

D. can't

胎粪的排出在出生后12小时，为墨绿色，喂奶后很块转为含奶块的金黄色，若24小时不见胎粪排出，要警惕（）畸形。

A、酶系统

B、泌尿系统

C、呼吸道

D、消化道