वेल्डिंग की स्थिति//Welding position//सर्वोत्तम युक्तियाँ और युक्तियाँ(1G, 2G, 3G ,4G //1F, 2F, 3F, 4F, 5F)_[Hindi]
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Негізгі бет Ғылым және технология Welding position 1G, 2G, 3G ,4G,1F, 2F, 3F
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