chemical form化学形态chemicaladj.化学的n.药品；化学物chemical contaminated area染毒区chemicals for oil recovery采油用剂chemical nitrogen fixation化学固氮chemically acid fertilizer化学酸性肥料chemical absorption method化学吸收法chemical wood preservation木材化学防腐法chemical skill competition技能大赛chemical reaction detector化学反应检测器Chemical reaction equation化学方程式chemical bonded refractory化学键结