30 تن از سرباره برنامه مخرب
کربلا کعبه ی دلهاست خدا میدا | تیر ۱۳۸۹. The heat input of electron beam welding is controlled by four variables: (1) the number of electrons per second hitting the work piece or beam current, (2) the electron speed at the moment of impact, the accelerating potential, (3) the diameter of the beam at or within the work-piece, the beam spot size, and (4) the speed ...
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