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如图所示的电路中,电源电压为9V,当开关闭合时,灯L1两端的电压也为9V,则产生故障的原因可能是______或_____
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______my parents ask me to do is_______more time on my studi
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Ten months ________ quite a long time,but we'll meet again s
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同义句转换:Please take care of your bags.2.Tom is in Class 1 ,and
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lt was a cold dark winter night.lt was getting
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