皮肤黏膜出现发绀时，毛细血管血液还原血红蛋白至少超过（） A.

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问题单项选择题 A1/A2型题

皮肤黏膜出现发绀时，毛细血管血液还原血红蛋白至少超过（）

A.75g／L

B.50g／L

C.100g／L

D.45g／L

E.30g／L

答案

参考答案：B

填空题

根据句意及汉语提示填写单词。

1. They ____________ (不会)go shopping. They ____________ (将)come to our party.

2. The beer will _______________(免费) if you have dinner in the restaurant.

3. There will be ______________(较少) free time in 200 years.

4. There are many kinds of ______________(污染) around us.

5. We should use both sides of ______________(纸).

6. Most people think that ______________(机器人) will be part of our lives.

7. Cities will be very big and ______________(拥挤的).

8. ______________(一切)is OK. Please come here.

单项选择题

基本符号是表示焊缝（）形状的符号。

A、横截面

B、纵截面

C、上表面

D、下表面