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【单选题】
某正弦电流的有效值为 7.07A ,频率 f =100Hz , j = - 60 ° ,则该电流的瞬时表达式为 ( ) 。A.
i =5sin(100 p t － 60 ° )A
B.
i =7.07sin(100 p t +30 ° )A
C.
i =10sin(200 p t － 60 ° )A
D.
i =10sin(200 p t +30 ° )A
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