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Berbagi pengalaman pengelasan. Pembelajaran teknologi pengelasan. Pengelasan busur argon 159 tabung geng putih 8 video definisi tinggi ketebalan dinding
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Pengelasan busur argon. Pelatihan pengelasan tukang las Lu Ge akan berbagi keterampilan pengelasan di ruang siaran langsung pukul 7.00 malam ini
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Kelas pengelasan umum Las busur kedua Pemotongan gas las argon, pipa tegangan tinggi Argon listrik Semua - Argon kiri dan kanan rintangan mie cermin kelas pengelasan. Keduo.
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