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【单选题】
如图所示,理想变压器的输入端接正弦交流电,副线圈上通过输电线接有两个相同的灯泡L 1 和L 2 ;输电线的等效电阻为R,开始时,电键K断开。当K接通时,以下说法中正确的是( )A.
副线圈的两端M、N的输出电压减小
B.
副线圈输电线等效电阻R上的功率减小
C.
通过灯泡L 1 的电流不变
D.
理想变压器的输入功率增大
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举一反三
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A.
bow to the Heaven and Earth
B.
bow to the matchmaker
C.
bow to the parents
D.
bow to each other, husband and wife
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A.
married to:got married
B.
married；married to
C.
been married to;got married
D.
been married；got married
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A.
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B.
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C.
catch
D.
find
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A.
《中国海关旅客须知》
B.
《导游服务规范》
C.
《中国旅游法》
D.
《国内游客导游服务规范》
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