Peb cov lim ob txheej muaj peb qhov zoo: 1. Lub taub hau siv ob txheej txheej lim kom tsis txhob muaj kab mob. Cov lim dej dawb (2/3), nrog lub qhov me me ntawm 10 μm, thaiv cov kua dej, sputtering thiab atmospheric sol molecules, thiab cov lim xiav (1/3) ), nrog rau cov...
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