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
3檔壓力簡易口罩，及過濾材料測試
zhang88 (2020-04-16 18:25:35) 評論 (0)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