题干
从方框中选择恰当的句子，将对话补充完整。
A—Mr. Black B—Shop Assistant
A: Good morning.
B: Good morning. Welcome! ____
A: Will you show me some T-shirts?
B: Sure. ____
A: Size fourteen.
B: ____
A: White.
B: Here you are. This is the best in our shop.
A: Good. 4. ____
B: Eleven dollars.
A: ____, please. Here's twenty fivedollars.
B: Here's your change. Thank you.
答案(点此获取答案解析）
B,A,D,E,C
示，D是一只二极管，它的作用是只允许电流从a流向b，不允许电流从b流向a ，平行板电容器AB内部原有电荷P处于静止状态，当两极板A和B的间距稍增大一些的瞬间(两极板仍平行)，P的运动情况将是（ ）
上单调递增的是
