题干
—Alice, would you like to go hiking with us?
—What a pity! I am free every day today.
A：for
B：except
C：besides
D：among
答案(点此获取答案解析）
B
V/m．已知一半径为1mm的雨滴在此电场中不会下落，取重力加速度大小为10m/
,水的密度为
kg/m3。这雨滴携带的电荷量的最小值约为 （ ）