All ：

是否有IPC 标准定义 PCB 生产前一定要烤板才能过reflow
No ,I do not think this is mandatory for SMT.

或者 是过期pcb 生产前一定要烤板才能过reflow  ？
Its depends, I do suggest do solderability test more than baking for those expired materials.

如有，能否share 相应的章节。

thanks
TERRY

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