钢水管厚度10mm，内直径为1m，钢材允许应力[σ]=160MPa，不计水重影响，则

完成句子。

1.我被选中来进行这项实验.

I was chosen to _________ _________ the experiment.

2.老师要求孩子们编一些关于中秋节的诗.

The teacher asked the children to some pomes about the Mid-Autumn Festival.

3.如果不亲眼看见外星人,我不会相信他们的存在.

If I don't see an alien my own eyes,I won't believe their existence.

4.他热衷于踢足球,几乎每天都训练.

He is so football that he trains almost every day.

5. 这对老夫妻生活得很和谐,他们从来不争吵.

The old couple live in each other and they never quarrel about anything.

收费员收取支票时，应仔细检查（）、（）、（）等是否清晰正确。

----_____I return the dictionary within three days?

----No, you_____. You_____ it for five days.

A．May; needn’t; can borrow

B．Can; mustn’t; would have

C．Must; don’t have to; can keep

D．Shall; can’t; should read

下列说法不正确的是[ ]

A．二氧化硫是形成酸雨的一种有毒的酸性氧化物    

B．浓盐酸可以用铝制容器盛装

C．浓硝酸保存需要用棕色瓶                      

D．NaClO中既有离子键又有共价键

输液的附加装置包括（），且必须无菌包装。

A.三通

B.延长管

C.肝素帽

D.过滤器

E.无针接头