功能：向系统剪贴板写入文字

wc：将选择文字复制到剪切板,可以直接粘贴，有效的避免cad卡顿造成时间上的浪费。

jj：将多个文本按选择顺序叠加合并复制到剪切板,可以直接粘贴，有效提高制图效率（不宜框选使用，避免造成合并次序不理想）。

-Function: write the text to the system clipboard

wc: Copy the text to the clipboard, you can paste it directly, effectively avoid cad Caton wasted time.

jj: a plurality of superimposed text merge order of your choice to the clipboard, you can paste it directly, effectively improve the efficiency of drawing (marquee should use to avoid merging order is not ideal).