玷污 发表于 2025-3-28 15:46:06

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Explosive 发表于 2025-3-28 19:40:36

Juan Sabia aluminium-zinc solders have also been used to a limited extent. Fusion welding was first accomplished by the oxy-acetylene process but is now carried out by means of GTA and GMA welding and sometimes using coated electrodes. The power source for GTA welding is usually an a.c. transformer with high
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查看完整版本: Titlebook: Solving Polynomial Equations; Foundations, Algorit Manuel Bronstein,Arjeh M. Cohen,Ioannis Z. Emiris Textbook 2005 Springer-Verlag Berlin H