试题与答案

下列哪些不属于可再生能源?()A、风能B、石油C、沼气D、水能E、核能

题型:多项选择题

题目:

下列哪些不属于可再生能源?()

A、风能

B、石油

C、沼气

D、水能

E、核能

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:打点计时器使用的是交流电,交流电的周期是0.02 s,每隔0.02 s打一次点,周期与电压的高低无关,也与纸带的运动快慢无关,只与频率有关,选项A、B错误、C正确。如果振针距离纸带太近,可能打...

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