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  1. Group I                                                              Group II

P. Arc welding                                                               1. Diffusion

Q. Friction welding                                                        2. Polarity

R. Solid state welding                                                   3. Focusing

S. Laser welding                                                          4. Kinetic energy

 

match the above

 

        P

         Q

          R

         S

      a

      4

      1

      3

      2

      b

      3

      2

      4

      3

      c

      1

      2

      4

      3

      d

      2

      4

      1

      3

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