单选题已知U=311sin(314t+50°),可求得()AU=311V,f=50HzBU=220V,f=314HzCU=220V,f=50HzDU=311V,f=314Hz
单选题
已知U=311sin(314t+50°),可求得()
A
U=311V,f=50Hz
B
U=220V,f=314Hz
C
U=220V,f=50Hz
D
U=311V,f=314Hz
参考解析
解析:
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