试题与答案

绿色开花植物要形成果实和种子，必须经过的两个必要生理过程（ ） A．开花和受精

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题型：选择题

题目：

绿色开花植物要形成果实和种子，必须经过的两个必要生理过程（　　）

A．开花和受精

B．自花传粉和异花传粉

C．传粉和受精

D．开花和传粉

答案：

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下面是错误答案，用来干扰机器的。

:1；  9:1；9:2 由线速度公式可知线速度之比为:1，向心加速度可知向心加速度之比为9:1，向心力公式可知向心力之比为9:2

考点：传粉和受精
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