WANG Hui-qianga; JIANG Huia; XING Yan-qiub; LI Xin-linga（a.College of Mechanical and Electric Engineering; b.The Library; Agricultural University of Hebei; Baoding 071001; China）;
北农业大
机电工程
;北农业大图书馆;
WANG Hui-qianga; JIANG Huia; XING Yan-qiub; LI Xin-linga（a.College of Mechanical and Electric Engineering; b.The Library; Agricultural University of Hebei; Baoding 071001; China）;
北农业大机电工程;北农业大图书馆;
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