在硝酸银溶液中加入钙盐A的溶液,产生白色沉淀,过滤后在滤渣中滴加稀硝酸,沉淀不溶

题型:填空题

问题:

在硝酸银溶液中加入钙盐A的溶液,产生白色沉淀,过滤后在滤渣中滴加稀硝酸,沉淀不溶解;在滤液中加入钠盐B的溶液,又产生白色沉淀.过滤后在滤渣中滴加稀硝酸,沉淀全部溶解并产生一种能使澄清石灰水变浑浊的气体.

(1)推断:A是______,B是______.

(2)写出A和硝酸银溶液反应的化学方程式______.

考点:物质的鉴别化学反应方程式的书写文字表达式化学式的写法和意义物质的推断
题型:填空题

流行是一种常见的心理态势,表现为社会或群体的成员在短时间内,由于追求某种生活方式而产生的相互感染或模仿。
根据上述定义,下列不属于流行现象的是:

A.大街上到处都可以看到全身牛仔到处窟窿的年轻人
B.最近在网络聊天时,很多人都在使用“囿”字
C.春天来了,许多人纷纷去郊外踏青
D.APEC会议以后,很多外国人喜欢上了中国的唐装

题型:填空题

阅读理解

       The summer vacation is over. It's true that time always flew fast.

       During the vacation, the weather was hot and I could not do much work, but I lived happily.

       As the afternoon was hot, I did my work in the morning. I used to get up at 6:30 and take a walk in

the garden for half an hour. After breakfast, I began reading English and Chinese and did some exercises

in maths. These would take me three hours or more. I worked quite hard and I believe I made good

progress.

       I spent the afternoon outside. I went to swim and it was full of fun. I would not go home until it was

late at about five or six o'clock. Sometimes a friend of mine would come to see me and we would spend

some hours listening to music.

       In this way I spent my vacation happily. And I not only studied well but also became a good swimmer. Now I am in good health and high spirits.

1. How long did it take the writer to do his homework?  

A. Half an hour.              

B. Three hours or more

C. Only one hour.              

D. Two hours and a half

2. The writer had very good summer holidays because he             .

A. worked very hard and made good progress

B. learned to swim and did his homework well

C. got up early and went home late

D. liked swimming better than studying

3. Which of the following is NOT true?

A. The writer made progress in his lessons.

B. The writer took a walk for half an hour before breakfast.

C. The writer began studying as soon as he got up.

D. The writer spent more time swimming than listening to music.

题型:填空题

某天,小明和小亮利用温差法测量紫金山一个山峰的高度,小明测得山顶温度为-1.1℃,同时,小亮测得山脚温度是1.6℃,已知该地区高度每增加100m,气温大约降低0.6℃,问这个山峰的高度大约是多少米?(请列式计算.)

题型:填空题

(2013·四川省六校第一次联合诊断)Both sides are determined to get what they want, and there seems to be no possibility of ________.

A.competence

B.composition

C.competition

D.compromise

题型:填空题

按_____键后,可删除光标位置前一个字符。

A.Insert

B.Del

C.Backspace

D.Delete

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