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【单选题】
已知正弦稳态电路如图所示,若 u s =10cos(2t+30 0 )V ,则电流 i 与电压 u s 的相位关系是( )。A.
i 滞后 u s 90 ⁰
B.
i 超前 u s 90 ⁰
C.
i 滞后 u s 45 ⁰
D.
i 超前 u s 45 ⁰
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