如图挂在弹簧下端的条形磁铁在闭合线圈内振动如果空气阻力不计则 A.磁铁的振幅不变 B.磁铁做阻尼振动 C.线圈中有逐渐变弱的直流电 Template




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tomski如图挂在弹簧下端的条形磁铁在闭合线圈内振动如果空气阻力不计则 a.磁铁的振幅不变 b.磁铁做阻尼振动 coloring