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当前学科:第一节切割和焊接
题目:
多选
镀层钢板的点焊技术要点有()。
A . 提高焊接电流
B . 减小电极压力
C . 电极材料可选用弥散强化铜
D . 结构允许时改用凸焊
E . 焊前表面清理
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