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A little sag is left in overhead telephone wires ____________

A little sag is left in overhead telephone wires ____________

A. because taut wires do not conduct sound easily
B. to allow for the effect of a rise in temperature due to heating effect of current flowing through them.
C. to allow for the effect of a rise in temperature of the surrounding atmosphere.
D. to allow for the effect of a fall in temperature of the surrounding atmosphere.





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