.两个正弦交流电流的瞬时值表达式为i1=20sin(314t+30°)A ,i2=15sin(314t+45°)A,这两个式子中相同的物理量是( )。
发布时间:2025-12-28
A.最大值
B.有效值
C.角频率
D.初相位
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