And, in terms of a graph, they correspond to slicing by a plane that's parallel to one of the coordinate planes, so that we either keep x constant, or keep y constant.
从图像上看,它们对应于,用平行于坐标轴的平面横截图像得到的,过程中保持x或y恒定。
Remember, partial f, partial x was obtained by y That means I am slicing the graph of f by a plane that is parallel to the x, z plane.
要记得,在这里的fx中,是作为常量保持不变的。,looking,at,the,situation,where,y,is,held,constant。,这是我用一个平行于xz坐标系的平面,横截了f,所得到的图形。
Remember that polar coordinates are about replacing x and y as coordinates for a point on a plane by instead r, r and theta,which is the angle measured counterclockwise from the positive x-axis.
极坐标是关于r,θ的,用r,θ代替平面上一点的x,y坐标,是从原点到那一点的距离,,which,is,the,distance,from,the,origin,to,a,point,θ是由x轴逆时针旋转,而得到的夹角。
Y-5 cargo-transport plane, the first cargo plane produced by P. R. China. The prototype is An-2, a biplane designed in 1940s' in USSR. Y-5 is produced by Nanchang Airplane Company.
运- 5运输机是我国第一种自行制造的运输机,由南昌飞机制造公司负责,其原型为苏联40年代设计的安- 2运输机。
Y-5 cargo-transport plane, the first cargo plane produced by P. R. China. The prototype is An-2, a biplane designed in 1940s' in USSR. Y-5 is produced by Nanchang Airplane Company.
运- 5运输机是我国第一种自行制造的运输机,由南昌飞机制造公司负责,其原型为苏联40年代设计的安- 2运输机。
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