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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