腹泻概述。

根据首字母填空，每空格填一词。

         These years, with the development of society (社会), more and more teenagers have suffered from stress. Some of the problems can make them feel very w     1      and unhappy all day. Who can help them? A teacher

from a college tried his best to help them. He thought of a lot of w       2     to help them. On Monday and

Thursday, you can c    3       his hotline. Here are some ideas how to keep the young men healthier in every

way. 

         F     4      , it is very important to keep healthy. To get e     5     sleep every day is also necessary. Try to

have a healthy d    6      every day. Secondly, maybe you are not the top student. It doesn't m    7    . The most

important thing is to work hard. If you try your best, your teachers and parents will understand you. If you have

some problems, you should be a     8      to talk with your teachers and parents. They can help you. Remember

to s    9      your happiness and s    10      with your good friends. Sometimes you can go out for a walk.

         In a word, you can try to make you happy by yourselves. I'm sure you can be happy every day.

1. w                    2. w                        3. c                       4. F                       5. e                  

6. d                     7. m                        8. a                       9. s                       10. s                   

《环境空气质量标准》中，SO₂的二级标准的1h平均浓度限值是（）mg/m³。

A.0.50

B.0.30

C.0.20

D.0.15

选择离子导入药物的原则，以下何者错误()

A．必须选择用量较小即能生效的药物

B．药物离子或胶体微粒的直径必须明显小于汗腺排泄孔的口径

C．药物成分可含寄生离子

D．药物在局部应用时也有疗效

E．贵重药物一般不宜大量作直流电导入

可摘局部义齿的连接体如位于基牙的倒凹区会引起（）。

A.对抗颊侧力减弱

B.基托厚度不够

C.义齿就位困难

D.连接不牢靠

E.以上均不对

与正弦整步电压最小值所对应相角差一定等于（）。

A.0

B.1

C.－1

D.2