试题与答案

饱和标准电池的()。A、温度系数大,允许放电电流小B、温度系数小,允许放电电流小C、

题型:单项选择题

题目:

饱和标准电池的()。

A、温度系数大,允许放电电流小

B、温度系数小,允许放电电流小

C、温度系数大,允许放电电流大

D、温度系数小,允许放电电流大

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:不同物种之间、生物与无机环境之间在相互影响中不断进化和发展,导致共同进化,D项正确;昆虫和保护色和天敌的视觉相互选择促进了生物的进化,故自然选择起作用,A项、D项错误;捕食者和被捕食...

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