几种短周期元素的原子半径及主要化合价如下表: 下列叙述中正确的是 [ ] A.X

题型:选择题

问题:

几种短周期元素的原子半径及主要化合价如下表: 下列叙述中正确的是

[ ]

A.X、Y元素的金属性:X<Y

B.一定条件下,Z单质与W的常见单质直接反应生成ZW2

C.Y的最高价氧化物对应的水化物能溶于稀氨水

D.一定条件下,W单质可以将Z单质从其氢化物中置换出来

考点:元素周期律元素的性质
题型:选择题

对滤过板的错误描述是()。

A.滤过板是为去掉低能部分,改善射线质量 

B.滤过板以降低剂量率,延长治疗时间为代价而提高平均能量 

C.同一管电压,滤过板不同所得半价层也不同 

D.使用复合滤过板,从射线窗口向,先放原子序数低的后放高的 

E.低能X线,滤过板材料为铝,能量较高时,材料为铜

题型:选择题

阅读理解。

     Most British telephone cards are just plain green, but card collecting is becoming a popular hobby in

Britain and collectors even have their own magazine, International Telephone Cards. One reason for their

interest is that cards from around the world come in a wide variety of different and often very attractive

designs. There are 100, 000 different cards in Japan alone, and there you can put your own design onto

a blank card simply by using a photograph or a business card.

     The first telephone cards, produced in 1976, were Italian. Five years later the first British card

appeared, and now you can buy cards in more than a hundred countries. People usually start collecting

cards because they are attractive, small and light, and they do not need much space. It is also a cheap

hobby for beginners, although for some people it becomes a serious business. In Paris, for example, there

is a market where you can buy only telephone cards, and some French cards cost up to 4, 000 pounds.

The first Japanese card has a value of about 28, 000 pounds. Most people only see cards with prices like

these in their collectors magazine.

1.The text is mainly about ________ .

A. the history of phone cards        

B. phone card collecting as a hobby

C. reason for phone card collecting  

D. the great variety of phone cards

2.When did people in Britain begin to use phone cards?

A. In 1971.

B. In 1975.  

C. In 1976.    

D. In 1981.

3.The main reason for most people to collect phone cards is that ________ .

A. they find the cards beautiful and easy to keep

B. they like to have something from different countries

C. they want to make money with cards

D. they think the cards are convenient to use

4.The writer mentions a market in Paris in order to show that ________

A. card collecting is popular among young people

B. French and Japanese cards are the most valuable

C. people can make money out of card collecting

D. card collectors magazines are very useful

题型:选择题

严格遵守纪律,执行安全措施,关心组员的安全,是()责任。

A、工作执行人

B、工作组员

C、工作监护人

D、工作许可人

题型:选择题

中国诗歌会是一个( )

A.以抗战为目标的现实主义诗歌团休

B.以大众化为目标的现实主义诗歌团体

C.以平民化为目标的浪漫主义诗歌团体

D.以诗美为目标的现代主义诗歌团体

题型:选择题

全面反映某一级行各项风险总体状况的报告为全面风险报告。全面风险报告分为季度报告年中报告和年度报告。

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