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  1. 1) Helium - used as inert gas shield for arc welding - used as a coolant medium for nuclear reactor 2) Argon - fills...

  2. tower crane 天稱 bulldoser 推土機 launching girder 曳進吊樑機 argon arc welding 氬氣焊 asphalt distributor 瀝青噴灑機 asphalt paver 瀝青攤鋪機 boring machine...

  3. ... Industry (Oxygen is used in cutting and welding metals. This is because a mixture of oxygen and ethyne burns...

  4. For breathing(eg. In hospital) In rockets and space shuttles(For support the combustion of fuel) In industry(For cutting and welding metal) photosynthesis(In plants)

  5. ... together to provide the very high temperatures needed for welding and metal cutting - utilized in medicine in the treatment of respiratory...

  6. ...actually adhere to each other, making what is called a "cold weld ". Once you reach a certain degree of mechanical smoothness, the frictional resistance...

  7. ...surface using sand or other particles Soldering, Brazing, Welding - a process for joining metals Tumble polishing - for...

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