封闭式弧光灯 [电] enclosed arc lamp

封闭式弧光 enclosed arc

电路闭合电弧 circuit closing arc

封闭式碳极弧灯 enclosed carbon arc lamp

封闭电弧焊 shield-arc welding

封闭式碳弧灯 carbon arc lamp

封闭汞弧整流器 seal-off mercury-arc rectifier

闭曲线弧 [数] closed curve arc

锁闭圆弧 locking arc