欧美图亚洲色另类色在线

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        Does the heat treatment of the preheating and post heat projects conflict with the welding heat trea

        First preheating and welding seam heat treatment does not conflict, heat and weld heat processing the specific situation and decide, such as equipment produced after heat treatment, welding mouth still need to heat, such as pipeline welding after the completion of the local heat treatment is not required to heat should be in welding seam welding after the completion of the immediate heat treatment.

         
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        欧美图亚洲色另类色在线
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