某城市污水处理厂规模为10000m3/d，总变化系数1.58，采用两组氧_爱下问搜题

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问题单项选择题

某城市污水处理厂规模为10000m³/d，总变化系数1.58，采用两组氧化沟工艺，由于该污水处理厂经常出现污泥膨胀，拟增设厌氧选择池控制污泥膨胀。该厌氧选择池的有效容积为（）。

A．600m³

B．500m³

C．400m³

D．300m³

答案

参考答案：C

解析：

查《室外排水设计规范》(GB 50014—2006)第6.6.13条，生物反应池的始端可设缺氧或厌氧选择区(池)，水力停留时间宜采用0.5～1.0h。

填空题

北美洲的移民主要来自于　　　洲，属于　　　　人种。　　　　　　

完形填空

“Cleverness is a gift while kindness is a choice．Gifts are easy—they're given after all. Choices can be hard．”
I got the to start Amazon 16 years ago．I the fact that the Internet usage was growing at 2300 percent per year．I’d never seen or heard of anything that grew so fast，and the idea of building an bookstore with millions of titles was very to me．I had just turned 30，and I’d been married for a year．I told my wife that I wanted to my job and go to do this crazy thing that probably wouldn’t since most start-ups don’t，and I wasn’t sure what to ．She told me I should the idea．I’d always wanted to be an inventor，and she wanted me to follow my ．
I was working at a financial firm in New York City with a boss that I admired very much．I went to my boss and with him that I wanted to start a company selling books on the Internet．He took me on a long walk in Central Park，listened to me，and finally said，“That sounds like a really good idea， it would be an even better idea for someone who didn’t already have a good job．”That logic made some to me，and he convinced me to think about it for 48 hours making a final decision．Seen in that light，it really was a difficult ，but finally, I decided I had to give it a shot．I didn’t think I’d regret and failing．And I suspected I would always be troubled by the decision not to try at a11．After much ，I took the less path to follow my dream，and I’m of that Choice．For all of us，in the end，we are our choices．

A．got through

C．came across

C．intelligent

A．consideration

B．determination

C．conversation

D．application

D．interesting