These can be "dragged out" of rulers, providing a vertical or horizontal line to reference as you place components on the workspace.
可以从标尺“拖出”这些线，作为在工作区上放置组件时的垂直或水平参考线。
The expression of complex amplitude is given in reference plane vertical to the optical axis by far-field approximation when the line source and the principal axis are at any Angle.
在柱坐标下从微分波动方程出发，推导柱面光波的场分布，并利用远场近似条件导出当线光源与光轴成任意角度时，在垂直光轴方向的参考面上的复振幅表示。
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