A.陽(yáng)性樹(shù)種、陰性樹(shù)種、中性樹(shù)種B.中生樹(shù)種、耐冷樹(shù)種、耐旱樹(shù)種C.耐寒樹(shù)種、耐凍樹(shù)種、中性樹(shù)種D.耐旱樹(shù)種、耐寒樹(shù)種、中生樹(shù)種
A、氮 B、銅 C、鐵 D、鋅
A、樹(shù)脂道 B、篩管 C、導(dǎo)管 D、表皮