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【单选题】
正弦交流的基本概念---20008 已知某正弦电压 V, 当 时 V, 当 时, V, 则该正弦电压有效值 等于 答( ) 答( )
A.
100V
B.
86.6V
C.
70.7V
D.
122.5V
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