Hanganga auaha
I roto i nga tau, i roto i te kaupapa o te "Kounga Kounga, Hangarau Arataki", kua whakawhanakehia e te kamupene te phosgene wai parakore-nui me te hanga tetraisocyanate rongoa rongoa (7900 #), te kounga teitei o te TPPT (tetraisocyanate phenyl ester) kaihoko whakawhiti (mo ...
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