题干
For professional athletes, ________ to the Olympics means that they have a chance to enter the history books.
A：acce
B：attachment
C：appeal
D：Approach
答案(点此获取答案解析）
A
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（ ）