视电阻率曲线的应用表现一哪些方面？

衡量系统风险的指标主要是β系数，一个股票的β值的大小取决于( )。

A．该股票与整个股票市场的相关性

B．该股票的标准差

C．整个市场的标准差

D．该股票的预期收益率

阅读理解

     Since 1984, Philadelphia has been cleaning up its act. One by one, graffiti(涂鸦)-covered walls are

being changed into outdoor art. So far, more than 1,800 murals (壁画) have been painted. Philadelphia

now has more murals than any other American city.

     The walls that were once ugly with graffiti are now covered with beautiful pictures of historical heroes

and modern art, thanks to the Mural Arts Program (MAP). Its work makes schools and public places

attractive, and its citizens are very proud. The program began as part of Philadelphia's Anti-Graffiti

Network. Jane Golden is the MAP's artistic director. "When people ask me what our program is about,"

she says, "I answer them with one word: hope." Each year, the MAP offers youth art programs and

workshops. Some one-time graffiti writers even help paint MAP murals.

     The MAP's work, says Golden, is all about developing a sense of community (社区). When a

neighborhood requests a mural, the MAP works with the people there to develop a message. Some

messages have been "Safe Streets," "Love and Care," and "Peace Walk."

     The MAP receives up to 50 requests for murals each week. Last year, the workers painted 140

murals.

     "The making of a mural enters people's collective memory as an extraordinary, pleasant moment in

neighborhood history" says Golden, who began as a muralist in Los Angeles.

1. What is the Mural Arts Program in Philadelphia aimed at?

A. Helping the young find jobs.

B. Protecting the neighborhood.

C. Fighting against graffiti.

D. Attracting more visitors.

2. How does the MAP decide on the message for a mural?

A. By having discussions with people in the community.

B. By seeking advice from the city government.

C. By learning from the young graffiti writers.

D. By studying the history of the city.

 3. Which of the following words best describes the work of the MAP?

A. Difficult.        

B. Dangerous.        

C. Experimental        

D. Successful.

脊柱中活动范围最大的是（）

A.颈椎

B.胸椎

C.T₁₁～L₁₂与L₁～L₂

D.腰椎

E.骶椎

当下肢动脉粥样硬化，行走时可发生腓肠肌（）

A.痉挛

B.萎缩

C.冰凉

D.疼痛

E.麻木

(四)

某建筑工程施工进度计划网络图如下图所示：

施工中发生了以下事件：

事件一：A工作因设计变更停工10d；

事件二：B工作因施工质量问题返工，延长工期7d；

事件三：E工作因建设单位供料延期，推迟3d施工；

事件四：在设备管道安装气焊作业时，火星溅落到正在施工的地下室设备用房聚氨酯防水涂膜层上，引起火灾。

在施工进展到第120天后，施工项目部对第110天前的部分工作进行了统计检查。统计数据如下表所示：

问题

施工总承包单位可否就事件一～事件三获得工期索赔分别说明理由。