Koj puas ntsib cov teeb meem ntawm phab ntsa putty?
Kev ziab sai yog vim li cas 1.Vim qhov kub ntawm lub caij ntuj sov, cov dej evaporates sai heev thaum lub sijhawm ua haujlwm ntawm scraping phab ntsa putty, uas feem ntau tshwm sim nyob rau theem ob ntawm kev tsim kho. 2.Cellulose ether cov dej tuav tsis zoo, tsim nyog cel...
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