double saw复齿锯doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double perovskite catalyst双层钙钛矿型催化剂double conversion receiver双变频接收机double-barrier structure双势结构Double-skin Curtain Wall双层幕墙double-double iron sheet叠轧铁板, 板轧制的黑钢皮double shoulder spring bar双轴肩表耳簧double-tangential firing双切圆燃烧double indicator titration双指示剂滴定法double contrast tomography双对比体层摄影(术)double-row concave ridge双行凹型垄