Hnub no wb tham txog "thermal paper"!Lub hauv paus ntsiab lus ntawm thermal ntawv yog coated rau ntawm daim ntawv dav dav particle hmoov, muaj pes tsawg leeg yog xim tsis muaj xim phenol los yog lwm yam acidic tshuaj, sib cais los ntawm ib zaj duab xis, nyob rau hauv kub kub, zaj duab xis melting, hmoov mix xim reactio ...
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