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2 alfa= dL/Lo dT
alfa= 0,24/200 . 100
alfa= 0,000012
3lT= lO . ALFA .Dt
Lt= 20 . 2.10^-5 .50
Lt= 0,02cm
2 alfa= dL/Lo dT
alfa= 0,24/200 . 100
alfa= 0,000012
3lT= lO . ALFA .Dt
Lt= 20 . 2.10^-5 .50
Lt= 0,02cm