某甲委托某乙去采购劣质钢材用于工程建设，则对于这种代理行为，说法正确的是( )。A

阅读短文，回答问题。

     Mr. Brown lived in a small town, but he worked in a big city. So he moved there with his wife

and two children last Tuesday.

     On the next day, Mr. Brown took his new car out and was washing it. When a friend came, the

friend stopped and looked at the new car for a minute. Then Mr. Brown turned and saw him.

     The friend said, "That's a new car. Is it yours?"

     "Sometimes, "Mr. Brown answered.

     The friend was surprised. "Sometimes?" he said, "What do you mean?

     Mr. Brown answered slowly, "Well, when there's a party in town, my daughter, Jean drives it.

When there's a football game, it's my son Joe's turn. When I have washed it and it looks really nice

and clean, my wife Linda uses it. And when it needs cleaning, it's mine.

1. Where did Mr. Brown live?

  _________________________________________________________________________

2. Where did Mr. Brown move to last Tuesday?

  _________________________________________________________________________

3. What was Mr. Brown doing when a friend came?

  _________________________________________________________________________

4. Who drives the car when there's a football game?

  _________________________________________________________________________

5. Does Mr. Brown drive the new car?

  _________________________________________________________________________

简述医院感染的分类。

政治体制改革要着重加强制度建设，这是为了

A．实现社会主义民主政治的制度化、规范化、程序化

B．实现社会主义政治制度的自我完善和发展

C．发展社会主义民主

D．建设社会主义政治文明

当有防水要求时，高层建筑地下室外墙混凝土强度等级和抗渗等级除按计算确定外分别不应小于()。

A．C30，0．4MPa

B．C30，0．6MPa

C．C35，0．6MPa

D．C35，0．8MPa

采用气相色谱法制定指纹图谱记录时间一般为

A．0.5h
B．1h
C．1.5h
D．2h
E．1～2h