机构:
North China Univ Sci, Qing Gong Coll, Tangshan 063000, Hebei, Peoples R ChinaNorth China Univ Sci, Qing Gong Coll, Tangshan 063000, Hebei, Peoples R China
Liu, Hongxiu
Ma, Shuyan
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机构:
Tangshan Vocat & Tech Coll, Dept Agr & Forestry Engn, Tangshan 063000, Hebei, Peoples R ChinaNorth China Univ Sci, Qing Gong Coll, Tangshan 063000, Hebei, Peoples R China