问题 多项选择题

骨料的筛分方法有______。

A.粗骨料选择水力筛分

B.细骨料选择机械筛分

C.粗骨料选择机械筛分

D.人工骨料选择水力筛分

E.细骨料选择水力筛分

答案

参考答案:C,D

解析: 骨料的筛分方法有机械筛分和水力筛分两种。前者利用机械力作用经不同孔眼尺寸的筛网对骨料进行分级,适用于粗骨料。后者利用骨料颗粒大小不同、水力粗度各异的特点进行分级,适用于细骨料。

阅读理解

阅读理解。

     BRITAIN is a popular tourist place. But tours of the country have pros and cons.

     GOOD NEWS

     Free museums. No charge for outstanding collections of art and antiquities.

     Pop music. Britain is the only country to rival (与…匹敌) the US on this score.

     Black cabs. London taxi drivers know where they are going even if there are never enough of them

at weekends or night.

     Choice of food. Visitors can find everything from Ethiopian to Swedish restaurants.

     Fashion. Not only do fashion junkies love deeply and respect highly brand names such as Vivienne

Westwood, Alexander McQueen; street styles are justly loved, too.   

     BAD NEWS   

     Poor service."It's part of the image of the place. People can dine out on the rudeness they have

experienced," says Professor Tony Seaton, of Luton University's International Tourism Research Center.   

     Poor public transport. Trains and buses are promised to defeat the keenest tourists, although the over

crowded London tube is inexplicably (难以理解的) popular.

     Lack of languages. Speaking slowly and clearly may not get many foreign visitors very far, even in the

tourist traps (圈套).   

     Rain. Still in the number one complaint.   

     No air-conditioning. So that even splendidly hot summers become as unbearable as the downpours.   

     Overpriced hotels. The only European country with a higher rate of tax on hotel rooms is Denmark.

     Licensing hours. Alcohol (酒) is in short supply after pm even in"24-hour cities".

1. What do tourists complain most?   

A. Poor service.   

B. Poor public transport.

C. Rain.   

D. Overpriced hotels.

2. What do we learn about pop music in Britain and the US through this passage?

A. Pop music in Britain is better than that in the US.

B. Pop music in Britain is as good as that in the US.

C. Pop music in Britain is worse than that in the US.

D. Pop music in Britain is quite different from that in the US.

3. When is alcohol not able to get?   

A. At 9: 00 pm

B. At 0: 00 pm

C. At : 00 pm

D. At 2: 00 pm

4. Which of the following is true according to the passage?   

A. You have to pay to visit the museums.   

B. It's very cheap to travel by taxi there.   

C. You cannot find Chinese food there.

D. The public transport is poor there.

单项选择题