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最佳答案:Tom usually has breakfast at 6:30 at home. He likes to eat fast food before, now
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最佳答案:i can understand the present situation totally and we are willing to help you to
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最佳答案:现在有个客户对H有兴趣,他想知道不同型号的H对应的光斑大小是否一样,不同的有效焦距对光的品质是否有影响,通常使用H时需要成组使用还是可以单独使用?Now one