咱们可以对管子进行下面所开列预制加工：割切以及机械加工坡口，手工以及自动烧焊等。
We can perform the pipe by following operations: cutting and mechanical chamfering, manual and automatic welding.
咱们可以对管子进行下面所开列预制加工：割切以及机械加工坡口，手工以及自动烧焊等。
We can perform the pipe by following operations: cutting and mechanical chamfering, manual and automatic welding.
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