double gapadj.双火花间隙的doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-ring laser beam双环光束double-zone combustion双区燃烧double dose prescription双剂量处方doubled back-to-back背靠背双拼double suspended channel二级悬河double-pour grain roll双层麻口铸铁轧辊, 双层细晶粒轧辊double pole double throw双刀双掷double-wall drill tool双壁钻具double complexing agents双络合剂double exponential model双指数模型