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火焰钎焊 huǒyàn qiānhàn
el. torch brazing; torch soldering
el.mach. gas brazing
met. flame brazing
火焰钎铜,硬
auto. torch brazing
火焰钎焊气焊 huǒyàn qiānhàn
nautic., tech. flame brazing
火焰钎焊: 3 phrases in 2 subjects
Metallurgy1
Technology2