1.Dab tsi yog biodegradable hnab yas yas degradation hais txog cov polymer mus rau qhov kawg ntawm lub neej voj voog, qhov hnyav molecular txo, kev ua tau zoo rau cov plaub hau yas, mos, tawv, nkig, tawg tsis muaj zog, degradation ntawm ordinar ...
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