pesticidesn.杀虫剂pesticiden.杀虫剂；农药pesticide-clay mixture毒土pesticide residue number杀虫剂的残留量pesticides multiresidues农药残留pesticides and herbicides农药Pesticide applied to grain谷物喷过农药pesticide residues of soil土壤农药残留物pesticide residue standard农药残留标准pesticide residue analysis农药残留量分析pesticide synergistic agent农药增效剂pesticide residual analysis农药残余物分析