double fan双风扇,二联通风机doubleadj.双重的；成双的；两倍的v.翻一番；使 ... 加倍n.两倍；双份double- reverse flotation process双反浮选double barreled forced coring tools双管强制取芯钻具double antibody radioimmuno-assay双抗体放射免疫测定法double-bridge differential wiring双桥差接线double-winding AC-DC generators双绕组交直流电机double-base two-phase structure双基体两相结构double-breasted shark-skin suit双排钮鲨鱼皮西装Double-null Asymptotic Additivity双零渐近可加double-shared double wheeled plow双轮双铧犁double chamber sand blast apparatus[机] 复室喷砂装置