单选题:从4种蔬菜品种中选出3种,分别植在不同土质的3块土地上进行试验,种植方法有(  )

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  • 题目类型:单选题
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题目内容:
从4种蔬菜品种中选出3种,分别植在不同土质的3块土地上进行试验,种植方法有(  ) A.4种.
B.24种.
C.64种.
D.81种.

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