Drag onto the page to add an all-around welding operation.
拖到绘图页后，可以添加圆周焊接操作。
Then you can check the operation of everything before doing the final welding.
然后你可以做之前检查最后焊接的一切运作。
Welding and geo-drilling must be strictly implemented operation system, due to special guard over homework.
电焊、气焊要严格执行操作制度，明火作业应有专人看守；
Welding and geo-drilling must be strictly implemented operation system, due to special guard over homework.
电焊、气焊要严格执行操作制度，明火作业应有专人看守；
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