TY - Journal of Yangtze River Scientific Research Institute A1 - T1 - Y1 - 2013-12-10 JF - Journal of Yangtze River Scientific Research Institute JO - Journal of Yangtze River Scientific Research Institute SP - 39 EP - 42 VL - 30 IS - 12 UR - http://ckyyb.crsri.cn N1 - 10.3969/j.issn.1001-5485.2013.12.007 ER -