两个同频率正弦交流电 流 i 1 、 i 2 的有 效值各为40A和30A。当 i 1 + i 2 的有效值为10A时, i 1 与 i 2 的相位 差是 ( )
A.
0 o
B.
180 o
C.
90 o
D.
270 o
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