13. A metal’s conductivity depends on temperature T. In classical physics, thermal speed describing the characteristic speed of the random motion of particles is proportional to . On the other hand, experiments show that resistivity is nearly proportional to
(A)
(B) 1/
(C) T
(D) 1/T
(E) T2 .

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統計： A(0), B(1), C(2), D(0), E(0) #3840123