self y Notice what I also do here, I create self dot y, give it a value, and then, oh cool, I can also set up what's the radius and angle for this point, by just doing a little bit of work.

我创建了，然后给它赋值，然后，噢太酷了，通过做一点额外的工作,就可以得到点的半径和角度了，好，实际上如果。

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

Phase analysis shows that the distance of crystal face of WC increases and oxide film of Y forms on the surface by Y ion implantation.

相分析表明，离子注入使WC晶面间距增大，稀土元素Y的注入在材料表面形成了Y的氧化物膜层。

youdao

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