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质量弹簧： m = 1 kg， k = 100 N/m，力 Fcos(omega t) ，无阻尼。对于哪个 omega 幅度发散（共振）？
质量弹簧： m = 1 kg， k = 100 N/m，力 Fcos(omega t) ，无阻尼。对于哪个 omega 幅度发散（共振）？
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