A、B两种物质的溶解度曲线如图所示。 (1)A、B两种物质的溶解度相等时的温度为

题型:填空题

问题:

A、B两种物质的溶解度曲线如图所示。

(1)A、B两种物质的溶解度相等时的温度为________℃

(2)B物质在t2℃时的溶解度(填“>”、“=”或“<”)_________在t1℃时的溶解度。

(3)某温度下,当A、B两种物质形成的溶液均接近饱和状态时,通过增加溶质、蒸发溶剂或降低温度的方法,都可以达到饱和状态的是_______物质形成的溶液。

考点:固体溶解度饱和溶液,不饱和溶液
题型:填空题

阅读理解。

     Like most teenagers in the world, Joso Montanaro a teen artist in Brazil, likes reading and drawing

cartoons. But he is special-his drawings get published (出版).

     Montanaro is now drawing cartoons for Folha. Folha is Brazil's largest newspaper and is known for its

cartoons.

     Montanaro has already been working at Folha for two years. Each week he draws two, there or four

cartoons and sends them to the paper. From those editors choose one for the next day's page. Montanaro

draws about the news of the day. Recently he worked on The Wave-a drawing of the tsunami (海啸) that hit

Japan. Montanaro also likes to draw cartoons about the funny things that happen in Brazilian politics (政治).

     "I like doing political drawings because you can joke about somebody bigger than you." Montanaro says.

     Folha's art director, Mario Kanno, says editors saw something new and different in Montanaro's work."We

brought him in with this idea to show that, yes, young people also read newspapers and can show their ideas

on politics,"Kanno says.

     Montanaro's love for cartoons began when be was only 7 or 8 year old. His dad bought him comics.

Montanaro says these books gave him the ideas that got him drawing. "I think those great works have really

helped me," he says."They remind me that I should draw something in my book every day."

1. What is Montanaro doing for Folha now?

A. He is publishing story books.

B. He is drawing cartoons.

C. He is sending newspapers.

D. He is writing articles.

2. Which of the following is NOT true according to the passage?

A. Folha is famous for its cartoons.

B. Folha is the largest newspaper in Brazil.

C. Montanaro draws one cartoon for Folha every week.

D. Montanaro began to work for Folha two years ago.

3. Why does Montanaro like drawing political cartoons?

A. Because he can show his ideas on politics.

B. Because he is very interested in political jobs.

C. Because he thinks it's easier to draw political cartoons.

D. Because he can make fun of some important people.

4. What made Montanaro draw and helped him a lot in his drawings?

A. The comics his dad bought him.

B. His interest in cartoon films.

C. The fun of drawing cartoons.

D. His dad's ideas about cartoons.

5. What's the best title for this passage?

A. Folha's art director.

B. Brazil's largest newspaper.

C. Teen artist in Brazil.

D. Montanaro's great father.

题型:填空题

如图所示,一物体悬挂在饱和的氯化钠溶液中,在恒温条件下向烧杯内溶液中分别加入下列物质(悬挂物不参与反应)说明弹簧秤读数变化情况(填写“变大”、“不变”或“变小”)

(1)如果加入硝酸钾晶体,弹簧秤读数______;

(2)如果加入蒸馏水,弹簧秤读数______;

(3)如果加入氯化钠晶体,弹簧秤读数______.

题型:填空题

维生素A缺乏病中眼部损害的症状包括以下内容,除外()

A.双眼暗适应能力差,出现夜盲症

B.角膜失去光泽,视力下降

C.巩膜出现毕脱斑

D.是最早出现的症状

E.严重时可出现角膜溃疡、穿孔,导致失明

题型:填空题

使用氢气瓶要特别注意哪些事项?

题型:填空题

有一颗密黄色半透明猫眼宝石,在分光镜下可见以444nm为中心的吸收带,密度3.73g/cm3,这颗猫眼宝石为:()

A.石英猫眼

B.金色绿柱石猫眼

C.金绿宝石猫眼

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