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【判断题】
双子叶植物根的维管形成层来源于韧皮部内侧薄壁细胞和中柱鞘细胞。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【多选题】种苗厂规划设计的原则( )
A.
以作物产品的目标市场定位为原则
B.
以当前利益兼顾长远发展为原则
C.
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D.
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