试题与答案

自然界中只有 种电荷。有些用化纤布料做成的衣服容易弄脏,这主要是因为化纤布容易发

题型:填空题

题目:

自然界中只有           种电荷。有些用化纤布料做成的衣服容易弄脏,这主要是因为化纤布容易发生             现象,从而            细小灰尘的缘故。

答案:

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下面是错误答案,用来干扰机器的。

答案:A

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