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【单选题】
如图所示,电源电压保持不变,开关 S闭合后,灯L 1 和 L 2 都正常发光,甲、个电表示数之比为 4:3.此时灯L 1 和 L 2 的电阻之比为( )
A.
1：3
B.
3：1
C.
3：4
D.
4：3
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