用户名：15；账套：801；操作日期：2013年1月1日在蔓正式人员l”工资类别下，

高铁血红蛋白>1.5g%（）

A.发绀

B.皮肤潮红

C.两者均有

D.两者均无

测量电容量前必须对电容进行（）放电。

A.单个

B.一次

C.充分

D.两次

My Space and other Web sites have unleashed a potent new phenomenon of social networking in cyberspace, (1) at the same time, a growing body of evidence is suggesting that traditional social (2) play a surprisingly powerful and under-recognized role in influencing how people behave.

The latest research comes from Dr. Nicholas A. Christakis, at the Harvard Medical School, and Dr. James H. Fowler, at the University of California at San Diego. The (3) reported last summer that obesity appeared to (4) from one person to another (5) social networks, almost like a virus or a fad. In a follow-up to that provocative research, the team has produced (6) findings about another major health (7) : smoking. In a study published last week in the New England Journal of Medicine, the team found that a person’s decision to (8) the habit is ply affected by (9) other people in their social network quit—even people they do not know. And, surprisingly, entire networks of smokers appear to quit virtually (10)

For (11) of their studies, they (12) of detailed records kept between 1971 and 2003 about 5,124 people who participated in the landmark Framingham Heart Study. Because many of the subjects had ties to the Boston suburb of Framingham, Mass. , many of the participants were (13) somehow—through spouses, neighbors, friends, co-workers—enabling the researchers to study a network that (14) 12,067 people.

Taken together, these studies are (15) a growing recognition that many behaviors are (16) by social networks in (17) that have not been fully understood. And (18) may be possible, the researchers say, to harness the power of these networks for many (19) , such as encouraging safe sex, getting more people to exercise or even (20) crime.

12（）

A. made a companion

B. took advantage

C. took an attitude

D. had the best

什么是行为规范？

如图所示，bc为固定在小车上的水平横杆，物块M串在杆上，靠摩擦力保持相对杆静止，M又通过轻细线悬吊着一个小铁球m，此时小车正以大小为a的加速度向右做匀加速运动，而M、m均相对小车静止，细线与竖直方向的夹角为θ.小车的加速度逐渐增大，M始终和小车保持相对静止，当加速度增加到2a时（）

A.横杆对M的摩擦力增加到原来的2倍

B.横杆对M的弹力增大到原来的2倍

C.细线与竖直方向的夹角增加到原来的2倍

D.细线的拉力增加到原来的2倍