(A) (d1/d2)0.8
(B) (d1/d2)0.5
(C) d1/d2
(D) (d1/d2)2
(A) (d1/d2)0.8
(B) (d1/d2)0.5
(C) d1/d2
(D) (d1/d2)2
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