A.n -1B.nC.n +1D.2^n
A.2^(h -1)B.2^(h -1)+1C.2^h -1D.2^(h +1)-1
A.二叉樹(shù)是度為2的樹(shù)B.一個(gè)二叉樹(shù)中結(jié)點(diǎn)的度都是小于2的C.二叉樹(shù)中至少要有一個(gè)結(jié)點(diǎn)的度為2D.二叉樹(shù)中結(jié)點(diǎn)的度可以是0,1,2