双绕灯丝灯泡 double coil lamp

双线圈灯丝 double coil filament

充气双绞丝灯泡 gas-filled dual coil lamp bulb

双平面式灯丝 biplane type filament

双灯丝灯泡 bilux bulb

双排丝灯 twin-filament lamp

双灯丝灯 dual filament lamp

双绕灯丝灯胆 double coil lamp

双稳态、灯丝电压 FF