3檔壓力簡易口罩，及過濾材料測試

來源: 於 2020-04-18 13:54:26 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

3檔壓力簡易口罩，及過濾材料測試

If your material led to a different conclusion, i.e. filter 1 is better than filter 2 under one pressure but the opposite is true under another pressure, please leave comments

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