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【单选题】
已知一个正弦交流电压为u = 311sin(100πt – 60°)V,则它的最大值、频率和初相分别是 。A.
220V 、 50Hz 、– 60°
B.
220V 、 100Hz 、– 60°
C.
311V 、 50Hz 、 60 °
D.
311V 、 50Hz 、–60°
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