Tsev »Khoom»0.45 μm syringe lim vs. 0.22 μm koob txhaj taub hau

0.45 μm syringe lim vs. 0.22 μm koob txhaj taub hau

Nyob5\ / 5 / raws li230Cov neeg siv khoom tshuaj xyuas
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Ntau cov koob txhaj tshuaj lim