UASB反应器的反应区中污泥床高度约为反应区总高度的1/3，但其污

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问题单项选择题

UASB反应器的反应区中污泥床高度约为反应区总高度的1/3，但其污泥量约占全部污泥量的（）以上。

A.1/3

B.1/2

C.2/3

D.3/4

答案

参考答案：C

填空题

根据中文提示拼写单词。

1. Zhalong is a good place for many _____ (濒于灭绝的) birds.

2. He hurt his left arm yesterday but it was not very _____ (严重的).

3. The weather report says the _____ (温度) will drop to -5℃ tomorrow.

4. There are a lot of _____ (老鼠) in that old house.

5. A strong earthquake _____ (发生) in Yushu, Qinghai province on April 14 th.

单项选择题 A1/A2型题

冷凝集素在以下哪一温度时与红细胞结合最好（）

A.4℃

B.22℃

C.32℃

D.37℃

E.42℃