试简述整体刚度矩阵的性质。

阅读理解。

     Jack was ten years old and he was a very lazy boy. He didn't like doing any work. He had to go to

school, of course, but he didn't study hard there and tried to do little work. His father and mother were

both doctors and they hoped that their son would become one too when he grew up. But one day Jack

said to his mother, "When I finish school, I want to be a dustman (垃圾工)."

     "A dustman?" his mother asked. She was very surprised. "That's not a good job. Why do you want

to become a dustman?"

     "Because I would only have to work one day a week," Jack answered at once.

     "Only one day a week?" his mother said. "What do you mean? And how do you know?"

     "Well," Jack answered, "I know that the dustmen came to work on Thursday every week, because

I only see them on that day."

1. How was Jack doing at school? [ ]

A. He liked his school.

B. He worked hard at school.

C. He didn't study hard at school.

D. He tried to do much work at school.

2. Jack's parents wanted their son to be a            . [ ]

A. doctor

B. dustman

C. teacher

D. worker

3. Jack hoped to be a dustman because he thought            . [ ]

A. that job was very important

B. the dustman worked only Thursday

C. he could make more money

D. that was a dirty job

4. Jack's mother felt surprised at his hope of being a dustman, because            .[ ]

A. their son was too young to be a dustman

B. a dustman worked only one day a week

C. it was hard to get such a job

D. that was not a good job

5. What do you think of Jack? [ ]

A. He was not very clever.

B. He was very lazy.

C. He liked the dustman's work.

D. He didn't want to be a doctor.

2006年3月27日下午4时45分，太旧高速公路（太原至旧关）太原到阳泉段寿阳县境内的一百米左右路基出现沉陷，至当晚七时左右，坍塌地段路基整体外移，长度约一百五十米，最大深度约五米。路基大塌陷，致使交通处于瘫痪状态。太旧高速公路是山西省的第一条高速公路，已经平安运行十年之久。据此回答15－16题。

小题1:关于此次事件原因的分析，你认为最可能是

A．该地发生了地震，导致泥石流

B．该路段地基出现滑坡现象

C．该建设项目是标准的“豆腐渣工程”

D．台风的影响导致洪水冲垮路基小题2:关于对该事件处理的措施，正确的是

① 立即抢修路面，保证交通畅通

② 启用交通应急预案，疏导公路交通

③ 查找塌陷原因，然后再整修路面

④ 宣布废弃该公路，重新修建新的一条高速公路

A．①②

B．②③

C．③④

D．②④

通过一年的化学学习，我们熟悉了许多物质．请从①石墨；②活性炭；③尿素；④氢气；⑤食盐；⑥氧气中，选取相应物质的序号填空．

（1）腌制蔬菜、鱼、肉等常用的调味品是______

（2）最清洁的燃料是______

（3）可用于冰箱除异味的是______

（4）属于化学肥料的是______

（5）用于急救病人的气体是______

（6）可作干电池电极的是______．

接待人员引导顾客坐在被服务的位置上，并将顾客的要求准确地告诉为其服务的美甲师，（）。

A.让美甲师开始服务

B.进一步沟通

C.进一步聊天

D.刺激顾客消费欲望

起重机械安拆作业指导书是起重机械安拆作业的工序工艺指导性文件，一旦经过批准，必须严格按照执行。起重机械安拆作业指导书编写纲要包括（）。

A.起重机械概括

B.编制依据

C.进度计划

D.工程准备