30. 一個高度為h的完整二元樹(complete binary tree)有幾個內部節點?
(A)2^h
(B)2^ (h-1)
(C)2^h +1
(D)2^h -1
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統計: A(1), B(15), C(11), D(32), E(0) #437098
統計: A(1), B(15), C(11), D(32), E(0) #437098