adj.六價(jià)的
"lead, cadmium, sexivalent chromium" 鉛、鎘、六價(jià)鉻
Keywords active carbon;deep-colored leather;sexivalent chromium ion（ Cr（VI））;dyestuff;de-coloring; 活性炭;深色革;六價(jià)鉻離子;染料;吸附脫色;
sexivalent - chromium 六價(jià)鉻
