Heartwood is often darker than the sapwood.
Heartwood is often darker than the sapwood.
下列哪个树木器官不参与光合碳产物分配( )。 A: 心材(heartwood) B: 边材(sapwood) C: 花果 D: 根系
下列哪个树木器官不参与光合碳产物分配( )。 A: 心材(heartwood) B: 边材(sapwood) C: 花果 D: 根系
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