chemicalpureadj.化学纯的chemicaladj.化学的n.药品；化学物Chemical control field常规化学防治田chemical dosing system投药控制系统chemical mutagens type化学诱变型chemical fibre factory化纤厂chemical process agent化工助剂chemical inhomogeneity化学不均匀性chemical pulverization化学粉碎法chemical weapons agent化学武器毒剂chemical reinforcement化学加固chemical sterilization化学绝育,化学药物灭菌法,化学灭菌