题目

You probably know who Marie Curie was, but you may not have heard of Rachel Carson. Of the outstanding ladies listed below, who do you think was the most important woman of the past 100 years?Jane Addams (l 860-1935)Anyone who has ever been helped by a social worker has Jane Addams to thank. Addams helped the poor and worked for peace. She encouraged a sense of community by creating shelters and promoting education and services for people in need. In 1931, Addams became the first American woman to win the Nobel Peace Prize.Rachel Carson (l 907-1964)If it weren’t for Rachel Carson, the enviro如图所示，两等量同种正点电荷固定在真空中，在它们连线的中垂线上有A、B两点，O为连线中点，C为连线上一点，下列结论正确的是（ ）A. B点场强一定大于A点场强B. B点电势一定低于A点电势C. 若把一正电荷从A沿直线移到C，电势能增加D. 若一负电荷仅在电场力下从C沿直线运动到O，加速度将变大