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Ｅｎｇｌｉｓｈ Ｔｒａｎｓｌａｔｉｏｎ ｏｆ Ｐｕｂｌｉｃ Ｓｉｇｎｓ ｏｆ Ｙｕｎｎａｎ Ｎａｔｉｏｎａｌｉｔｉｅｓ Ｖｉｌｌａｇｅ：Ｐｒｏｂｌｅｍｓ ａｎｄ Ｓｏｌｕｔｉｏｎｓ
YANG Yan
JOURNAL OF KUNMING METALLURGY COLLEGE . 2014, (4): 89 -92 .  DOI: １０．３９６９／ｊ．ｉｓｓｎ．１００９－０４７９．２０１４．０４．０２０