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问题 单项选择题

一组折板絮凝池流量Q=0.305m3/s，絮凝池分为三段，每段长与池宽相等，均为1.6m，第一段为相对折板，第二段和第三段均为平行直板。已知相对折板峰速v1=0.25～0.35m/s，谷速v2=0.1～0.15m/s，计算其峰距L1和谷距L2分别为（）。

A．1.23～0.568m和3.04～2.087m

B．0.76～0.54m和1.9～1.27m

C．1.8～1.25m和0.74～0.36m

D．3.02～2.08m和1.20～0.768m

答案

参考答案：B

解析：

填空题

单词拼写。

     根据下列句子及所给汉语注释或单词首字母，在句子右边的横线上，写出空

缺处各单词的正确形式。(每空只写一词)

1. She hopes to be a __________(音乐家) in the future.

2. More and more classrooms in cities are _______ __(配备) with computers.

3. Shortly after the big fire broke out, two _______ __(打) firefighters arrived to fight it.

4. The couple have _______ __(定居) down in the city for twenty years.

5. December is the t________ month of a year.

6. He had sold all his p__________ and left his hometown.

7. The machine won't f_______ properly if you don't oil it well.

8. F______ is the mother of success.

9. There are 200 people ___________ (出席的) at the meeting.

10. The boy succeeded in r_______ a drowning child.
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单项选择题

筛检试验中对筛查计划投入的费用与获得的生物学效果进行分析，称为（）.

A.成本效益分析

B.成本效果分析

C.成本效用分析

D.成本比较分析

E.单成本分析
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