题目内容
(请给出正确答案)
[单选题]
已知某正弦交流电流的频率为50Hz,则其周期为多少()
A.50S
B.1S
C.0.2S
D.0.02S
答案
D、0.02S
如果结果不匹配,请 联系老师 获取答案
A.50S
B.1S
C.0.2S
D.0.02S
D、0.02S
A.u=380sin314tv
B.u=537sin(314t+50°)v
C.u=380(314t+90°)v
D.380sin(314t-90°)v
A.100mH
B.83mH
C.76mH
D.65Mh
A.3.872kW
B.2.872kW
C.4.672kW
D.6.562kW