慢性支气管炎的慢性迁延期是（） A.咳、痰、喘1周 B.咳、痰、

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问题单项选择题

慢性支气管炎的慢性迁延期是（）

A.咳、痰、喘1周

B.咳、痰、喘2周

C.咳、痰、喘，迁延1个月以上

D.咳、痰、喘中的任一症状加剧1周

E.咳、痰、喘，迁延3个月以上

答案

参考答案：C

选择题

在pH=1的溶液中，可以大量共存的是：

A．Na⁺、K⁺、S^2-、Cl-

B．Al³⁺、Mg²⁺、SO₄^2-、Cl^-

C．Na⁺、K⁺、AlO₂^-、NO₃^-

D．Na⁺、K⁺、SO₃^2-、SO₄^2-

填空题

选择适当的连接词 that, which , who填空。

1. That is the book I bought yesterday.

2. Is he the person you met outside the school gate yesterday?

3. I know the movie you talked about last night.

4. He doesn't want the watch is on the second shelf.

5. Do you like people often think about themselves?