所以右边为零时，有两种情况。

So, in that case, if the right hand side is zero, there's two cases.

youdao

传递零时则会刷新当前页面。

Passing zero will trigger a reload of the current page.

youdao

当点乘的数量积为零时,这两个向量垂直。

These two vectors are perpendicular exactly when their dot product is zero.

youdao

So, we just talked about the force law to describe the interaction between a proton and an electron. You told me that when the distance went to infinity, the force went to zero. What happens instead when the distance goes to zero? What happens to the force?

我们刚刚讨论了描述质子,和电子之间相互作用力的定律,当距离变为无穷时,力变为零，那当距离变为,零时会发生什么？,这时候力是多少？

麻省理工公开课 - 化学原理课程节选