A.6 B.5 C.7 D.4
A.5 B.6 C.7 D.8
A.非葉子結(jié)點(diǎn)只有左子樹(shù)的二叉樹(shù) B.只有根結(jié)點(diǎn)的二叉樹(shù) C.根結(jié)點(diǎn)無(wú)右子樹(shù)的二叉樹(shù) D.非葉子結(jié)點(diǎn)只有右子樹(shù)的二叉樹(shù)