So, remember, when we did it first over z, we start by fixing a point, x and y, and for that value of x and y, we look at a small vertical slice and see from where to where we have to go.

要牢记，当我们对z积分时，首先固定一个点，看看它们的值，取一个垂直切片,并找出z的积分限。

youdao

So, remember, when we did it first over z, we start by fixing a point, x and y, and for that value of x and y, we look at a small vertical slice and see from where to where we have to go.

要牢记，当我们对z积分时，首先固定一个点，看看它们的值，取一个垂直切片,并找出z的积分限。

youdao