所有酸性焊条采用交流电源焊接，焊厚板时y用直流正接，焊薄板时用直流反接。-查字典考试网

所有酸性焊条采用交流电源焊接，焊厚板时y用直流正接，焊薄板时用直流反接。

1、正确
2、错误

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正确答案：

答案解析：

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