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A 3G mobile phone, ______to be most useful and fashionable, is popular with some teenagers.
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灯泡用久了灯丝会变细,玻璃泡会发黑,是由于钨丝在高温下______,钨蒸气遇到温度较低的玻璃泡又______的缘故(填物态变化名称).
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For many years, no one could communicate with people who had been born without hearing.
1年前
王叔叔把8000元钱存在银行,存期三个月,年利率2.5%,到期能从银行取回()元钱.(利息税5%)
1年前