Hangzhou Dayangchem Co., Ltd.   Lanzhou Jianxing Commercial and Trading Co., Ltd.   jiande dayang chemical co.,ltd   Hebei Dayang Animal Healthcare Foods Co.,Ltd   Lanzhou Jiaotong University   Lanzhou Tech Biochemical Co., Ltd   Lanzhou Institute of Chemical Physics   Lanzhou Ocean Chemical Industry Science and Technology LTD.   Lanzhou boc chemical Co., Ltd   Lanzhou Xiangxin Industry & Trade Co.,Ltd.   lanzhou fly chem technology co., Ltd   Hangzhou Dayangchem Co., Ltd.   Lanzhou Huanghe Zinc Product Co.,Ltd   Lanzhou SchiffChem Co.,Ltd   Lanzhou Weiri Bio-Engineering Co.,Ltd.   lanzhou aglichem co.,ltd   Lanzhou Jiayuan Bio-tech Co., Ltd   Lanzhou biological essence Industrial Co., Ltd.   lanzhou kejin biotechnology Co., Ltd   Dongguan Dayang Aerosol Factory