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下列结论:①数轴上的点只能表示有理数;②任何一个无理数都能用数轴上的点表示;③实数与数轴上的点一一对应;④有理数有无限个,无理数有有限个。其中,正确的结论有_________个.
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I turned to bookshops and libraries looking for information and found _______.
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For many years, no one could communicate with people who had been born without hearing.
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某手机市场供给函数为Q=-2000+3p需求函数为Q=2000-P求均衡价格和均衡产量
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