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(1) What is the minimum number of FRF 's required to obtain the first 3 natural frequencies and modal damping for a fixed-free beam,

(1) What is the minimum number of FRF 's required to obtain the first 3 natural frequencies and modal damping for a fixed-free beam, experimentally. (A) 1 (B) 2 (D) more than 3 (C) 3

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