Create new file 1280 x 1024 px. Create a rectangular selection in the center of the image, hit Q to enter quick mask mode.

建立一张1280*1024的白底画布.然后在画布中间用选框工具建立一个矩形选区 进入快速蒙版模式(Q).

youdao

Let's call it q. P is the point that coordinates x, y, h.

就叫它q, p的坐标是。

youdao

We want to know whether a given vector field with components P, Q and R can be written as f sub x, f sub y and f sub z for a same function f.

要看向量场,能否写成，其中f是同一个函数。

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