A.激光焊机 B.窄搭接 C.闪光焊机
A.降低了轧件和辊系降温度 B.减小了金属的变形抗力 C.ESI越高越好 D.皂化值越高越好
A.0.5mm B.0.6mm C.0.7mm D.0.8mm
A.20mm B.50mm C.30mm D.35mm
