... 铜板垫单面潜弧焊 flux copper backing welding (F.C.B.) 铜背垫(电焊) copper backing 铜锤 copper hammer ...
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... back welding 封底焊 copper backing (C.B.) 铜垫法 flux copper backing (F.C.B.) 焊剂铜垫法 ...
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flux copper backing method 焊药铜板背衬法
flux copper backing 焊剂铜垫法
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