85. A tetracyclic compound, aldrin , was used as an insecticide. How many double bonds are presented in aldrin?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

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統計： A(0), B(11), C(1), D(1), E(2) #2911433

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C12H6Cl8 0個不飽和度時，可接的...

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