A group of boys from a primary school soccer team in Anshun, Guizhou Province, are doing daily training on the playground. The team was made 1 their P. E. teacher Mr. Zeng. And their headmaster Mr. Xiong also 2 a lot. Although the members practice 2 hours every day, playing soccer does not 3 their studies or farm work. Most of these boys’ parents work in big cities far from the village. In the past, they were afraid of showing themselves in public, 4 now through soccer, they have become outgoing, active and brave. And their skills in soccer have improved rapidly by working hard. In a sho
下图所示,平行直线表示电场线,但未标方向,带电为+10-2 C的微粒在电场中只受电场力作用,由A点移到B点,动能损失0.1 J,若A点的电势为-10 V,则
①B点的电势为10 V
②电场线方向从右向左
③微粒的运动轨迹可能是轨迹1
④微粒的运动轨迹可能是轨迹2
以上正确的是:
A.
①③
B.
②④
C.
②③
D.
①④