管道高频焊机可以对由钢板卷成的圆管
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管道高频焊机可以对由钢板卷成的圆管的接缝实施焊接。焊机的原理如图所示，圆管通过一个接有高频交流电源的线圈，线圈所产生的交变磁场使圆管中产生交变电流，电流产生的热量使接缝处的材料熔化将其焊接。焊接过程中所利用的电磁学规律的发现者为（ ）
A. 库仑
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传统观点认为，英国成为工业革命发源地，是因为英国最早具备了技术
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2021年5月10日 am11:08
据《史记》记载，春秋时期，楚国国君熊通要求提升爵位等级
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