题干
.
I’d appreciate _______if you would like to teach me how to use the computer.
I’d appreciate _______if you would like to teach me how to use the computer.
A：you
B：that
C：thi
D：it
答案(点此获取答案解析）
D
轴上场强E随位置
其中
为大于0的常数，单位为
，
。有一带正电的试探电荷在
处由静止释放。若不考虑其它力的作用。则试探电荷（ ）