˹á arrow L arrow Line spectra
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Line spectra PDF
໡ ໡Դôٴ׹ѧͤѧշǤ§ҧ

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 http://faraday.physics.utoronto.ca/IYearLab/Intros/Spectra/Spectra.html 
        http://
www.faqs.org/ docs/qp/chap04.html