热辐射过程中没有导热和对流两种形式的存在。

阅读理解。

     In most parts of the world, many students help their schools make less pollution (污染). They join

"environment clubs (环境俱乐部)". In an environment club, people work together to make our

environment clean.

     Here are some things students often do.

     No-garbage (垃圾) lunches. How much do you throw away after lunch? Environment clubs ask

students to bring their lunches in bags that can be used again. Every week they will choose the classes

that make the least garbage and report them to the whole school!

     No-car day. On a no-car day, nobody comes to school in a car-not the students and not the

teachers! Cars give pollution to our air, so remember:

     Walk, jump, bike or run.

     Use your legs! It's lots of fun!

     Turn off the water! Did you know that some toilets can waste(浪费) twenty to forty m3 of water an

hour? In a year, that would fill a small river! In environment clubs, students mend those broken toilets.

     We love our environment. Let's work together to make it clean.

1. Environment clubs ask students         .

A. to run to school every day            

B. to take exercise every day

C. not to forget to take cars              

D. not to throw away lunch bags

2. From the passage we know the students usually have lunch         .

A. at school          

B. in shops        

C. in clubs        

D. at home

3. On a no-car day,          will take a car to school.

A. both students and teachers              

B. only students

C. neither students nor teachers            

D. only teachers

4. After students mend toilets, they save          .

A. a smaller river      

B. a club      

C. a lot of water      

D. a toilet

5. The writer wrote the passage to ask students to          .

A. clean schools    

B. make less pollution      

C. join clubs      

D. help teachers

用硅胶管采样时，湿度可影响最大采样体积。湿度增大，可引起采样体积（）

A.成正比增大

B.不变

C.成指数增大

D.减小

E.不确定

下屈服强度和抗拉强度的比值叫做（）。

A.屈强比

B.屈服极限

C.屈服比

D.强度比

观察中毒性肺炎的病情变化，最重要的是

A．意识状态

B．体温、热型

C．脉搏、血压

D．呼吸频率及深度

E．痰的性状

ONU的注册方式分为（）和（）两种。&NbsP；