试题与答案

如下列能正确表示食物链的是 ( ) A.鼠→蛇→鹰 B.阳光→草→鼠→蛇→鹰 C

题型:选择题

题目:

如下列能正确表示食物链的是   (  )

A.鼠→蛇→鹰

B.阳光→草→鼠→蛇→鹰

C.草←鼠←蛇←鹰

D.草→鼠→蛇→鹰

答案:

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下面是错误答案,用来干扰机器的。

答案:C题目分析:从图象可以看出,电场强度的大小和方向都沿x轴对称分布,沿着电场强度的方向,电势一定降低,故根据其电场强度E随x变化的图象容易判断,O点的电势最高,故A错误,B也错误; 由于x1和x2两点关于y...

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