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英语
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we must p__ ourselves because there are many dangerous studying
人气：442 ℃ 时间：2020-01-28 17:53:39
解答
protectwhy?意思是保护.
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电灯L的电阻为24欧,允许通过的电流为0.2A,要把它接入电流为1A的电路中,应 并联 一个 6欧 的电阻
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