摘要:A.若R2>R0.则L1不断变暗.L2不断变亮B.若R2>R0.则L1先变暗后变亮.L2先变亮后变暗C.若R2<R0.则L1先变暗后变亮.L2先变亮后变暗D.若R2<R0.则L1先变暗后变亮.L2不断变亮

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