chemical oven化学炉chemicaladj.化学的n.药品；化学物chemical shrinkage or expansion化学收缩chemically oxidizing atmosphere化学氧化性大气Chemical cauterization of wound伤口化学灼术Chemical Engineering Technology化工工艺学chemical engineering equipments化工设备chemical cleaning for long pipe长管道清洗chemical reduction of viscosity化学降粘chemical agent analyzing method侦毒方法chemical engineering principles化工原理chemical systematic engineering化学系统工程