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 reheat power generation sets二次再热机组double crystal X-ray spectrometer双晶体X射线光谱计double-focusing mass spectrometer双聚焦质谱仪double cotton-covered copper wire双纱铜包线Double differential current bridges双桥差double-ended open-jawed spanner双端开口爪形扳手Double-Gamma scintillation models双Gamma模型double-row spherical ball bearing双列球面球轴承Double trailing arm type suspension双曳臂式悬吊系统double-pole double-break method双极双断法