低压液化气体使用（）。A、无缝气瓶 B、焊接气瓶 C、液化石油气钢瓶

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     Every day when I enter the classroom, I will take a look at the wall beside my seat. You will find

nothing special about this old wall if you just look at it. But for the students in my class, it is a special

wall. Take a good look at it, and you will get to know the real feelings and thoughts of us, the 9th

graders.

     In the middle of the wall, there is a big "VICTORY". It was written in pencil. I guess it must have

been written by someone who got a good mark in an exam.

     A little higher above the formulas, there is a poem. It only has two sentences. It reads: All those

sweet memories have disappeared. Like tears dropping in the heavy rain.

     Oh! It must have been written at the end of the last semester in middle school. Classmates had to

leave school and good friends had to part.  What a sad poem!

     If you "explore" the wall more carefully, you will find many other interesting things, like a crying

face, or a happy face, and other patterns(图案). There are still some patterns and letters that I can't

understand, but they all show the feeling of the students who drew them.

     For years, the wall has witnessed(目睹) all the things that have happened in the classroom. I don't

know how it will be next year, two years from now, or even ten years from now. But I hope more

smiling faces will be drawn on it.

1. There is ____ special on this wall.

A. something

B. anything

C. nothing

D. everything

2. What was the “VICTORY” written in?

A. Chalk

B. Pencil

C. Pen

D. Brush

3. When has the poem been written?

A. At the beginning of the last semester.

B. At the end of the year.

C. At the end of the last semester.

D. At the beginning of the last month.

4. What’s the meaning of the underlined word?

A. 部分

B. 分离

C. 和好

D. 聚集

5. What’s the title of the passage?

A. The Pictures of the Wall

B. The Feelings of the Students

C. The Patterns (图案) of the Classroom

D. The Hope of the Writer

血培养仪的检测信号不包括（）。

如图所示，一轻杆AB，A端铰于低墙上，B端用细线系住跨过低墙顶上的C点用力F拉住，并在B端挂一重物．现缓慢地拉线使杆向上转动，杆与墙的夹角θ逐渐减小．在此过程中，杆所受的压力N和拉力F的大小变化情况是（　　）

A．N和F均变大

B．N变小，F变大

C．N变大，F变小

D．N不变，F变小

施工场地的道路宽度应在（）m以上。

A、2

B、2.5

C、3

D、3.5

简述层状云与积雨云相对荷电谱分布之间的差异