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並前往https://journals.sagepub.com/doi/10.1177/1721727X16659289

Structural changes in periodontium of rats exposed to a low ...

0.250×UF÷RGDR(ET)=0.250×3÷0.18=4.15ppm(or4155ng/mL). Eventually, it was found that a H2S concentration of 4.15 ppm in rats was equal to the H2S ...

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