Decas德卡Decn.十二月n.美国数字电子公司decatron scaler十进管计数器Decarburizafion脱碳declining phase衰退阶段decreasing cost递减成本decennial index十年索引decatyl alcohol癸醇decholin method脱氢胆酸法(循环时间测定法)decigram method分克法decimeter mixer分米波段混频器decing chemical除冰剂, 防冻剂