已知正弦交流量,电压u=311sin(6280t-240)V,则该交流量的初相位是()?
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已知正弦交流量,电压u=311sin(6280t-240)V,则该交流量的初相位是()?
A.—240°
B.240°
C.120°
D.—120°
参考答案:
已知正弦交流量,电压u=311sin(6280t-240)V,则该交流量的初相位是()?
A.—240°
B.240°
C.120°
D.—120°
参考答案: