当梁突出顶棚高度（）时，要按设计规范进行计算，确定保护面积和梁间区域探测器的个数。

单词拼写（根据所给首字母和中文提示完成各句，使句意通顺。）

小题1:People in this small town are busy making _______(准备) for the coming Spring Festival.

小题2:Wherever we are, we must pay more attention to our ______(行为，举止).

小题3:If they keep on doing that kind of thing, they will no longer ____(值得) any trust from me.

小题4:I think they should give us an ________ (解释,说明)for their being late.

小题5:A-H1N1 control and prevention is a ________ (有挑战性的) job to China as well as the whole world.

小题6:It was almost ten years before the people in that small country finally got it freedom and _________ (独立).

小题7:Some supermodels are far too skinny to be _________ (有吸引力的) enough by people.

小题8:After graduation, he went _________ (市中心) and tried his luck.

小题9:You shouldn’t be _________ (尴尬的) about your weight, for nothing is more important than health.

小题10:There are many ______(争论) against smoking. Some are for it while some are against it.

小题11:They made so much noise that I couldn’t c________ on my study in the classroom.

小题12:My dad and mum don’t a________ of me going home later than 9 p.m..

小题13:I r________ to tell you that our library will be closed for the sports meeting for three days.

小题14:I heard that the basketball match would be b_______ live on TV at 7 p.m. this Sunday.

小题15:The torch of friendship between the two countries will be handed from one g________ to another.

由于战争、自然灾害可形成大面积的研究样本群称为（）.

A.天然实验

B.自我实验

C.志愿实验

D.临床实验

E.强迫实验

运输定价中，下列属于竞争导向定价法的有( )。

A．优质优价定价法

B．流行水准定价法

C．渗透定价法

D．权衡比较定价法

E．逆向倒推定价法

为什么奶牛喜欢卧在地下而很少走动？