x zero gear 零变位齿轮
X-zero gear 非变位齿轮
F-Zero X 未来赛车 ; 将来赛车
X-zero gear pair 非变位齿轮副
Zero X 未来赛车
T-zero Turbo X 星际赛车
So, at that point, the partial derivative is zero with respect to x.
因此这点上x的偏导为零。
So the signs in the velocity and the signs in average acceleration depend crucially on how I have defined my increasing value of x not where I choose my zero points.
所以速度的符号,和平均加速度的符号,这二者都取决于,这里x正方向,是如何定义的,和0点的选取没有关系。
So, let's say that I take a unit square -- -- so, something that goes from zero to one both in x and y directions.
我现在用一个单位正方形——,在x和y方向上都是从0到1变化。
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