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听力原文:W: Hi, Mike. M: Hi. I'm surprised to see you on the city bus. Why not drive your car? W: (23)I've been thinking about the environment lately. If we all use public transportation when we could, the air will be much cleaner. M: Right. But the bus isn't exactly pollution free. W: True. But they'll be running a lot cleaner soon, We were just talking about that in my environmental engineering class. M: What's the city going to do? Install pollution filters of some sort on their buses? W: They could, but those filters make the engines work harder and really cut down on fuel efficiency. Instead they found a way to make their engines more efficient. M: How? W: Well, (24)there is a material called the coniine oxide. It's a really good insulator. And a thick coat of it gets sprayed on the certain part of the engine. M: An insulator? W: Yes. (25)It reflects back the heat of burning fuel. So the fuel will burn much hotter and burn up more completely. M: So a lot less unburned fuel comes out to pollute the air, right? W: Yeah, and the bus will need less fuel. So with the savings on fuel cost, they say this will all pay for itself in just six months. M: Sounds like people should all go out and get this stuff to spray their car engines. W: Well, not really that easy. To melt the materials before you can spray a coat of it on the engine parts, you first have to heat it over 10,000 degrees. It's not something we are able to do ourselves. (20)
A.
Something is wrong with her car.
B.
The cost of the fuel is high.
C.
It's cheap to take bus.
D.
She thinks public transportation is environmental friendly.
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【简答题】为了分析悬浮颗粒在实际沉淀池内的运动规律和沉淀效果,提出了"理想沉淀池"的概念,下列不属于该过程中理想沉淀池的假设条件是什么?
【单选题】在简单随机重复抽样条件下,当抽样平均误差缩小为原来的1/2时,则样本单位数为原来的(    )。
A.
2倍    
B.
3倍
C.
4倍    
D.
1/4倍
【单选题】为了分析悬浮颗粒在实际沉淀池内的运动规律和沉淀效果,提出了“理想平流式沉淀池”的概念,下列不属于该过程中理想沉淀池的假设条件是( )。
A.
污水在池内沿水平方向做等速流动,水平流速为v0,从入口到出口的流动时间为t
B.
污染物被絮凝以后沉淀即认为被去除
C.
在流入区,颗粒沿垂直截面均匀分布并处于自由沉淀状态,颗粒的水平分速等于水平流速
D.
颗粒沉到底即认为被去除
【单选题】配送中心配送是按照实施配送的( )不同对配送进行分类的。
A.
结点
B.
配送商品的种类
C.
配送时间
D.
配送数量的多少
【单选题】为了分析悬浮颗粒在实际沉淀池内的运动规律和沉淀效果,提出了“理想沉淀池”这一概念。不属于该过程中理想沉淀池的假设条件是( )。
A.
污水在池内沿水平力向做等速流动,水平流速为v,从入口到出口的流动时间为t
B.
污染物被絮凝以后沉淀即认为被去除
C.
在流入区,颗粒沿垂直截面均匀分布并处于自由沉淀状态,颗粒的水平分速等于水平流速v
D.
颗粒沉到池底即认为被去除
【简答题】Captain Cook, the famous explorer, met with an unusual animal during his first visit to Australia. He pointed to the animal grazing in the distance, and asked his native guide to name it. The guide ap...
【单选题】在简单随机重复抽样条件下,当抽样平均误差缩小为原来的1/2时,则样本事数为原来的( )
A.
2倍
B.
3倍
C.
1/4倍
D.
4倍
【单选题】在简单随机重复抽样条件下,当抽样平均误差缩小为原来1/2时,则样本单位数为原来的?
A.
2倍
B.
3倍
C.
4倍
D.
1/4倍
【单选题】在简单随机重复抽样条件下,当抽样平均误差缩小为原来1/2时,则样本单位数为原来的()
A.
2倍
B.
4倍
C.
1/2倍
D.
1/4倍
【单选题】I’d like to book a single roo m .
A.
套房
B.
单人间
C.
双人间
D.
三人间
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