AUTOMATIC SUBMERGED ARC WELDING OF INTERNAL CIRCMFERETIAL SEAM OF VESSEL CLOSURE
容器合拢口内环缝的埋弧自动焊
The speed of root differentiation was fast, differetiation rate of root and raising ability were highest under red light.
红光下根的分化速度最快，根分化率及综合培养力最高。
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