Select the Rectangular Marquee Tool (m) and create two 1px lines on top of each other; the lines should be 850 pixels wide from the left guide to the right guide.
选择矩形选框工具(m)层叠的创建两个1px的线条；宽度为850px，从左参考线到右参考线。
2
A design method of the dielectric-covered slots arrays in the narrow face of a rectangular wave-guide is presented in this paper.
本文提供了带共形罩矩形波导窄边缝隙天线阵的一种设计方法。
3
To start, choose the Rectangular Marquee Tool from the Tools Panel and create a rectangular selection using the following figure as a guide.