急性胰腺炎患者禁食胃肠减压的目的是（）。 A.减少淀粉酶分泌 B.减少脂肪酸分泌 C

生命活动的主要承担者是 [ ]

A．蛋白质

B．糖类

C．核酸

D．脂质

在平面坐标系中，以点（0，1）为圆心，2为半径的圆与x轴的正半轴交于点A，则A点的坐标为______．

根据句意及所给中文提示或英文解释，写出句中所缺单词，每空限填一个单词。

1. People like travelling in _________ (春天) because it is neither too hot nor too cold.

2. -What’s your father’s ________ (职业)?-He is a doctor.

3. The 30th Olympic Games will be held in London, the ________ (首都) of England.

4. Lucy is polite and _______ (乐于助人的). We all like her.

5. Our maths teacher asked you to go to his office ________ (立即). He is waiting for you.

6. Colours can change our moods and some may make us feel _________ (in need of sleep).

7. Hurry up, or we can’t ________ (arrive at) the railway station on time.

胃阴亏虚之胃痛的主症是

A．口燥咽干

B．胃痛隐隐

C．大便干结

D．舌红少津，脉细数

为什么CO₂焊比焊条电弧焊效率高？