常见例句双语例句Substituting double electrode for normal tungsten and substituting spherical constricting nozzle for normal cone one are the key to design the torch.用球面压缩喷嘴取代常规的锥形压缩喷嘴，这些是设计反极性弱等离子弧粉末堆焊枪的关键所在。 返回 constricting nozzle