A.樹(shù)籬形 B.匍匐形 C.棚架形 D.叢狀形
A.40%~50% B.50%~60% C.60%~70% D.75%~90%
A.1/2~1/3 B.1/2~1/5 C.1/3~1/5 D.1/4~1/5