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最佳答案:They are in the parkIt means “No climbing ”No ,it doesn'tIt means “Keep off the
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最佳答案:解题思路:(1)图中电路的电流方向是从N型半导体经A流向P型半导体,铜片A会从空气吸收热量,铜片B会向空气放出热量,故要使一个电冰箱箱内的温度下降,铜片A置于电
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最佳答案:其实,答案还是自己做的好.
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最佳答案:68.on condition that / if the women are given vitamins69.poor growth ,mental dev
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最佳答案:68.on condition that / if the women are given vitamins69.poor growth ,mental dev
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最佳答案:我家孩子书上第六课没有这题
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最佳答案:73.In Shanghai and its suburbs.74.To search for/look for jobs/work.75.It was den
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最佳答案:58. His memory is not often used.59. They become weak.60. How To Have a Good Mem
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最佳答案:解题思路:(1)LED节能灯是用发光二极管作光源的,工作时,消耗了电能,因此把电能转化为光能。(2)普通节能灯光效率低的原因是:节能灯发热小,90%的电能转化为