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在图Ⅱ-9所示交流电路中，U=100V。当f=50Hz时，X C1 =10Ω，X L1 =10Ω，X C2 =20Ω，X L2 =5Ω。求下述两种情况下的电流I。 (1)f=50Hz (2)f=100Hz
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