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˜ÇÖ÷  °l(f¨¡)±íÓÚ: 2010-11-16 14:13
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1˜Ç  °l(f¨¡)±íÓÚ: 2010-11-16 14:25
=1400/1000*50
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    tlq302
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    °l(f¨¡)Ìû”µ(sh¨´)Á¿: 496 ‚€(g¨¨)
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    2˜Ç  °l(f¨¡)±íÓÚ: 2010-11-16 14:27
    „‚²ÅŒ‘åe(cu¨°)ÁË‘ª(y¨©ng)Ô“ÊÇ1000/1400*50=35.7Hz