20 若某一無向圖(undirected graph)G,含有 V 個頂點(vertices)與 E 個邊(edges),則所有頂點的分支度(degree)的總和等於?
(A)E
(B)2E
(C)V
(D) 2V
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統計: A(46), B(312), C(41), D(79), E(0) #1843916
統計: A(46), B(312), C(41), D(79), E(0) #1843916