A.根系發(fā)達,樹冠濃密 B.樹干通直,材質(zhì)好 C.抗風(fēng)力強,樹形高大 D.壽命長,經(jīng)濟價值高
A.18%~22% B.28%~32% C.38%~42% D.48%~52%
A.10% B.30% C.50% D.70%