建设工程项目设计质量控制的内容包括（）。 A．可靠性质量控制 B．观感性质量控制 C

)如图所示，两根直金属轨道ab、cd水平平行放置，相距L，距地面的高度为H。ef、gh为与水平轨道接触良好并相切的半圆金属轨道，其半径为r，在竖直面内相互平行放置。水平轨道不光滑，半圆轨道光滑，整个轨道处于竖直向上的磁感应强度为B的匀强磁场中。水平轨道的左端接有电阻R，右端静止放一电阻也为R的金属杆，质量为M，与水平轨道垂直。一个质量为m的小球，以速度v₀水平向左撞到金属杆的中点，撞击后小球反弹落到水平地面上的位置距水平轨道的右端的水平距离为S。金属杆在水平轨道上运动的过程中，通过电阻R的电荷量为q。金属杆运动到半圆轨道的最高点时，对轨道的压力为mg，水平轨道左端电阻R上产生的总焦耳热为Q。若M＝2m，轨道电阻忽略不计。求：

（1）金属杆运动到半圆轨道的最高点时的速度大小是多少？

（2）小球与金属杆碰撞后的瞬间电阻R两端的电压是多少？

（3）金属杆与水平轨道间的动摩擦因数是多少？

王某注册了一家公司，主营业务是对外租赁建筑机械。2005年3月8日，王某委托李某购买一台压路机，于是李某前往外地压路机生产厂家，王某却因突发脑梗死亡，由于事发突然，三天后，在外工作的儿子回家才发现父亲已经去世。此时李某已经购买了王某委托购买的压路机。李某找到王某的儿子向他说明了购买压路机的事宜，但是王某的儿子却以父亲已经于签订购买压路机合同之前就去世了，所以他与李某的委托代理终止，李某应自行为购买压路机承担责任。就此案例说法正确的是< )。

A．《民法通则》规定代理人死亡导致委托代理终止，所以李某需自行处理

B．王某未与李某签订委托合同即死去，不受法律保护

C．李某在外购买压路机并不知道王某已死亡，所以其代理行为有效，但因未签订正式合同所以其购买行为已经无效，所以王某儿子作法合理

D．李某在不知道王某已死亡的情况下购买压路机，其代理行为有效，其发生费用应由王某所遗留遗产中支付

当事人对仲裁协议的效力有异议的，当事人（）。

A.不能请求仲裁委员会作出裁决

B.不能请求人民法院作出裁定

C.可以请求人民政府作出裁定

D.可以请求仲裁委员会作出决定

If we want to deal with the association（交往） between boys and girls properly, here are some “dos and don’ts” for you to follow.

Keep a normal and healthy state of mind. Our schools and classes are made up of boys and girls. It is very natural for the boys and girls to make friends with each other. We should make as many friends as possible. We should keep in touch with the other sex（性别） in public instead of in secret.

Don’t be too nervous or too shy. If you are a shy person, you can also find a way out. First of all, you can make friends with the students who have the same interest and hobby as you. As both of you have much in common, you may have much to talk about. If you keep doing like that, little by little, you will gladly find you are also as free to express yourself as others.

Don’t fall into the ditch of early love. The boys and girls at adolescence（青春期） are rich in feeling. They are easy to regard the friendship as a sign of love and fall in love with each other at an early age. In my opinion, early love is a green apple that can’t be eaten. An apple won’t taste sweet until it is fully ripe. Boys and girls at middle school are too young to carry the heavy duty of love. Do keep out of early love.

小题1:The main idea of the passage is to ______.

A．tell students to keep away from early love

B．give some advice on how to associate between boys and girls

C．tell students how to make friends

D．teach boys how to talk with girls小题2:We should keep in touch with the other sex in the following EXCEPT ______.

A．with a good state of mind

B．in real friendship

C．in public

D．in secret小题3: If you are a shy person, you can _______.

A．find friends with the same interest and hobby first

B．only have a few friends of the same sex

C．not make friends with the other sex

D．not fail in love with other students easily小题4:What does the underlined word “ditch” mean?

A．波浪

B．泥潭

C．圈套

D．迷惑

下列哪项是原癌基因的表达产物

A．细胞外生长因子

B．跨膜的生长因子受体

C．胞内信号转导体

D．核内转录因子