double-J双J管doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double-bladed knife switch双闸刀开关double piston brake cylinder双活塞制动缸double sprocket movie camera双链轮摄影机double-motion raddle mixer双动浆叶式搅拌机double-pole single-throw[化] 双刀单掷; 双刀单掷开关double-base number systems双基数系统double grating monochromator双光栅单色仪double current bridge duplex双流桥接式双工double track haulage roadway双轨运输巷道double crystal monochromator双晶单色器

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