chemicalpureadj.化学纯的chemicaladj.化学的n.药品；化学物chemical energy source化学能源chemical metallurgical冶化chemicalclassification化学品分类chemical oxyyen demand化学需氧量chemical investigation化学检验,化学分析chemically measurement化学量测chemical bonding resin化学键合型树脂chemical heterogeneity化学不均一性Chemical Service Truck化学品勤务车chemical foaming agent[化] 化学发泡剂