A.4% B.3% C.2% D.1%
A、陰性樹(shù)種宜稀 B、陽(yáng)性樹(shù)種宜稀 C、慢生樹(shù)種宜稀 D.陽(yáng)性樹(shù)種宜密
A.40-85% B.≤40% C.≥85% D.≥90%