1, installation yog nruj heev.Saib xyuas lub dav hlau zoo li qub thiab zoo li qub ntawm lub tshuab foob, xws li qhov tshwm sim kub hnyiab, dav hlau blackening thiab sib sib zog nqus kab, sealing roj hmab hardening, poob ntawm elasticity, qhov tshwm sim no tshwm sim los ntawm lub installation ntawm nruj heev.Kev daws: kho qhov insta ...
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