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回覆 18# motherotk 的文章
Just for fun.
You said how to draw a perfect circle.... I taught him to use templates, like for circles, chemistry-apparatus, eclipse, flowchart symbols, electronic & electrical symbols......... just small tricks all diagrams are perfect, because of tools.
Go to any big bookstores, you can find them. In my good old days, all come from Germany, very expensive, now come from Taiwan or China, very reasonable. |
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