ac welder造句

• Arcs more readily than ac welders , with longer arcing
  起弧比交流电容易，电弧加长一倍。
• Dc welders pose no danger of shock ( labor safety regulations require that ac welders be fitted with anti - shock systems to guard against fatal shock to operators )
  直流电焊机不会电击人体劳检所规定交流电焊机需装电击防止器装置以防止人员发生感电死亡。