行政机关实施行政许可时，下列哪一做法是正确的？（）A、要求申请人购买指定商品 B、要求

患者，女，因心慌就诊。在门诊做心电图(图4)。

关于房颤的心电图改变正确的是（）

A．心房率350～600/min

B．心室率不规则

C．快速房颤室率可达180～250/min

D．可出现室内差异性传导

E．伴R-R＞1.5s常提示存在二度房室传导阻滞

阅读理解。

A SCHOOL REPORT

Name: Edward Scott    School: Revin Grove State High School

Grade: 7 Term ending: 6 May

Subjects (科目):

Mathematics

He is a little weak (弱) in this, but he has tried his best to catch up with others.

Science

He can work out many difficulties. Well done!

French

He is the best in the class. Keep it up.

History

He is not so good at this, but has done better than before.

Geography

He is familiar (熟悉的) with the names of many places in the world.

Music

He doesn't like pop songs, though sings very well.

Conduct: Fair No. in class: 9 Absences: 8

Remarks (评语): Edward has the ability to do a lot better. More work is needed next term.

Class teacher: Ivy

Principal: M. L. Martin

School reopens: 11 September

1. After reading this, we know this is _____.

    A. a studying plan of Edward Scott

    B. a teaching plan of Ivy

    C. a school report of Edward Scott

    D. a working plan of M. L. Martin

2. Which of the following is NOT mentioned(提到) in the passage? 

    A. PE.

    B. Music

    C. Mathematics

    D. History

3. Edward's best subject is _____.

    A. science

    B. English

    C. geography

     D. French

4. Edward is NOT so good at _____.

    A. science and geography

    B. mathematics and history

    C. history and French

    D. music and English

5. According to the passage, which of the following sentences is TRUE?

    A. Edward can't sing songs very well.

    B. Edward doesn't do well in science.

    C. Edward can do better if he works harder next term.

    D. Edward learns two foreign languages in school.

若A=x²-2xy+y²，B=x²+2xy+y²，则4xy=（　　）

A．B-A

B．B+A

C．A-B

D．2A-2B

风湿热关节炎的特点是（）

A.单个关节受累

B.受损部位固定

C.预后不留畸形

D.局部皮肤破溃

E.常见指关节受损

（20分）现用质量分数为98%.密度为1.84 g/ml的浓硫酸来配制500ml0.2mol/l的稀硫酸，可供选择的仪器如下；①玻璃棒②烧瓶③烧杯④胶头滴管⑤量筒⑥容量瓶⑦托盘天平⑧药匙请回答下列问题。

（1）上述仪器中，在配制稀硫酸时用不到的仪器有­             （填序号）

（2）经计算，需浓硫酸的体积为             。现有①10ml.②50ml.③100ml三种规格的量筒，你选用的量筒是­         （填序号）

（3）将浓硫酸稀释后，冷却片刻，随后全部转移到       ml的容量瓶中，转移时应用玻璃棒       ，转移完毕后，用少量蒸馏水洗涤烧杯玻璃棒2~3次，并将洗涤液也转入容量瓶中，在加适量蒸馏水直到液面接近刻线       处。改用        滴加蒸馏水到瓶颈刻度的地方，将溶液振荡，摇匀后，装瓶，贴签。

(4)下列情况对所配制的稀硫酸浓度有何影响？（用偏高、偏低、无影响填写）

A、容量瓶用蒸馏水洗涤后未干燥_________________；

B、所用的浓硫酸长时间放置在敞口容器内_________________；

C、定容时仰视溶液的凹液面_________________；