双开式的弹簧门 swing door

双开式弹簧铝门 aluminum swing door

双开式旋转铰链 [木] helical hinge

开式双柱可倾压力机 open-back inclinable press ; open type double-column inclinable press

折叠式双开门 double swinging door

双列直插式开关 dual-in-line package switch

双联式开关管 [电] dual TR tube

双柱式隔离开关 double-column disconnector

明装跷板式双控开关 Surface-type Rocker Two-way Switch

暗装跷板式双控开关 Flush-type Rocker Two-way Switch