单项选择题

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单项选择题
（ ）A.B.C.D.
单项选择题
The connections of two sets of three phase load is shown in the figure. The three phase source is balanced. Line voltage is U˙AB=380∠30oV and the impedance are Z1=100+j60Ω, Z2=50−j80Ω.The value of A phase current I˙
A．dc
B．even sine
C．even cosine
D．odd sine
E．odd cosine
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