权威例句
Oxyfuel Cutting and Welding 8609-A Instructional Materials Service Texas A&M University Introduction Oxy[Students and instructor in welding class]FUNDAMENTALS OF THE PROCESSOxy-fuel_welding_and_cuttingUrticaria and Asthma from Acetylene Welding.Acetylene welding reelAcetylene welding reelResearch on environmental impact assessment of flame oxyacetylene welding processesThe Toxicology of Oxy-Acetylene Welding.The development of the oxy‐acetylene welding and cutting industry in the united states