问题
不定项选择
位于A、B处的两个带有不等量负电的点电荷在某一平面内电势分布如图所示，图中实线表示等势线，则
A．a点和b点的电场强度相同
B．正电荷从c点移到d点，电场力做正功
C．负电荷从a点移到c点，电场力做正功
D．正电荷从e点沿图中虚线移到f点，电势能先减小后增大
答案
CD
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位于A、B处的两个带有不等量负电的点电荷在某一平面内电势分布如图所示，图中实线表示等势线，则
A．a点和b点的电场强度相同
B．正电荷从c点移到d点，电场力做正功
C．负电荷从a点移到c点，电场力做正功
D．正电荷从e点沿图中虚线移到f点，电势能先减小后增大
CD
It's not just women who wear skirts. Men can wear them, too. In Scotland, men wear a kind of skirt called a kilt. The kilt is their national dress and an important part of their tradition (传统). A kilt is a colored skirt reaching down to the knees(膝盖). It has checks (格子) on it with different colors, like red or blue. Each family in Scotland has its own colors. How did the Scots start to wear kilts? There are many stories about it. One story is that the kilt was invented (发明) in the 1720s by an English factory owner, Thomas Rawlinson. Rawlinson had a lot of Scottish workers in his factory and he thought their clothing got in the way of their work. So he cut their long clothes into a shorter skirt. Today, most Scotsmen see kilts as formal(正式)dresses. They usually only wear them at weddings or big dinners. There are only a few men who still wear a kilt every day. Scots also wear kilts in parades when they play their traditional musical instrument(乐器): bagpipes (风笛). The army still has kilts as the dress uniform (制服), but they no longer wear them to fight (打仗). 小题1: A kilt is ____.
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