问题 问答题 计算题

简述城市生活垃圾物理成分分析样品的制备和保存方法。

答案

参考答案:

(1)制备方法:将测定容重后的大块垃圾破碎至小于50mm的小块,摊铺在水泥地面充分混合搅拌,用四分法缩分2(或3)次至25~50kg样品,置于密闭容器运到分析场地,确实难全部破碎的可预先剔除,在其余部分破碎缩分后,按缩分比例,将剔除垃圾部分破碎加入样品中。

(2)保存方法:采样后应立即分析,否则必须将样品摊铺在室内避风阴凉干净的铺有防渗塑胶布的水泥地面,厚度不超过50mm,并防止样品损失和其他物质的混入,保存期不超过24h(垃圾发热量的测定试样保存期可为三个月)。

阅读理解

Hundreds of people lined up at Grand Central Terminal yesterday, but they

weren’t there to catch a train. They came to New York City’s famous railroad station to trade in old dollar bills for the new George Washington Presidential苊1 coin.

The gold-colored coin is the first in a new series by the U.S. Mint(造币厂)that honors former U.S. Presidents. The Mint will issue(发行) four Presidential苊1 coins a year through 2016. Like the popular 50 State Quarters program, which issues coins in the order in which each state joined the Union, Presidential苊1 coins will come out in the order in which each President served. The George Washington coin is the first to be released. John Adams, Thomas Jefferson and James Madison coins will come out later this year.

The Presidential 苊1 coins will be the same size and color as the Sacagawea Golden Dollar. However, there is an important difference. For the first time since the 1930s, there is an inscription(题字)on the edge of each coin. Each coin will show a different President on its face, or head side. It will also show the President’s name, the order in which he served and his years in office. The other side of the coin will show the Statue of Liberty and the inscriptions “United States of America” and “苊 1”.

There will be one Presidential苊1 coin for each President, except Grover Cleveland. He will have two! Cleveland is the only U.S. President to have served two nonconsecutive(不连续的)terms.

The last President scheduled to get a coin is Gerald Ford because a President must have been dead for two years before he can be on a coin.

小题1: Why did people line up at the railway station?

A.To book train tickets.

B.To exchange money.

C.To visit a coin show.

D.To visit the station itself.小题2:In which order will the Presidential苊1 coins come out?

A.Each state joined the Union.

B.Each President was born.

C.Each President took office.

D.Each President died.小题3:It can be inferred from the passage that         .

A.there are no words on the Sacagawea Golden Dollar

B.the new coin can buy more than the old coin

C.the new coin takes on a white color

D.the Sacagawea Golden Dollar is bigger小题4:Why will Grover Cleveland have two coins?

A.He served longer than any other President.

B.He is the most famous President in the U.S.

C.He is the only one who has served two terms.

D.He served two terms but not continuously.小题5:Which of the following could be the best title of the passage?

A.Presidential苊1 coin issued.

B.Different ways to honor Presidents.

C.The differences between Presidential苊1 coin and other coins.

D.Collections of old dollar bills.

判断题