久久国产欧美日韩精品,日韩国产精品久久久久久亚洲,99视频精品全部免费免费,91精品国产综合久久走光

As a result, the reduction efficiency of charcoal, anthracitic and bituminous are better than pulverized coke.結(jié)果表明:木炭 、 無煙煤、煙煤作為還原劑還原效果明顯優(yōu)于焦粉....

adj.無煙煤的，似無煙煤的...

anthracitic的音標(biāo)：anthracitic的英式發(fā)音音標(biāo)為：[?nθr?'s?t?k]anthracitic的美式發(fā)音音標(biāo)為：[?nθr?'s?t?k]...