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Which of the two generalized constants of a transmission line are equal?

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Which of the two generalized constants of a transmission line are equal? 

(a) B & C (B) A & B (c) A & D (D) B & D

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Which of the two generalized constants of a transmission line are equal? 

(a) B & C (B) A & B (c) A & D (D) B & D

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