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词语相切拆分为汉字：
相字的拼音、笔画、偏旁部首、笔顺、繁体字，相字字源来历，相字演变
1. 相 [xiāng]2. 相 [xiàng]相 [xiāng]交互，行为动作由双方来：互～。～等。～同。～识。～传（chuán ）。～符。～继。～间（jiàn ）。～形见绌。～得益彰（两者互相配合，更加显出双方的长处）。动作由一方来而有……
切字的拼音、笔画、偏旁部首、笔顺、繁体字，切字字源来历，切字演变
1. 切 [qiē]2. 切 [qiè]切 [qiē]用刀从上往下用力：～菜。～除。～磋（本义是把骨角玉石加工制成器物，引申为在业务、思想各方面互相吸取长处，纠正缺点，如“～～琢磨”）。切 [qiè]密合，贴近：～当（dàng ）。～肤（切……
汉语拼音：xiāng qiē
Lines which are everywhere tangential to the direction of the flow of electric current are called streamlines .
处处均与电流方向相切的曲线称为流线。As you approach the top of the second circle, wait until a tangent constraint symbol appears.
当您接近第二个圆的上方时，请等待，直到显示相切约束符号。Finally, calculate the parameters included in the production function, thereby obtain the concrete form of production function.
最后，利用相切条件计算生产函数所含参数，从而确定生产函数的具体形式。And so that means that any vector u, any unit vector tangent to the level set of g is going to be perpendicular to the gradient of f.
也就是说，任何向量u，任何与g的水平集相切的单位向量，应该要与f的梯度垂直。CAUTION: Tangency between cylinders occurs at the center plane of the cylinders only if the cylinders are of equal diameter .
仅当两个圆柱孔直径相等时，相切发生在圆柱中心平面。When it appears, release the mouse button to place the endpoint of your line coincident and tangent to the second circle.
显示后，释放滑鼠按钮以置入与第二个圆重合并相切的直线端点。The jet of water strikes the runner tangentially to a circular line of the pitch diameter of the buckets and acts as atmosphere pressure.
射流以与转轮节圆直径相切的方向冲击到斗叶上，其工作压力为大气压强。Repeat the previous steps to place the lower line segment coincident and tangent to the bottoms of the circles.
重复先前的步骤，以置入与圆的底部重合并相切的下方直线段。So the derivative in any direction, tangent to g equals c, should be the directional derivative of f, in any such direction, should be zero.
所以这个与g=c相切的导数，应该是f的方向导数，在这个方向下，应该是等于0的。