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【单选题】
已知两正弦电流 i 1 =220 √2 sin (314t)A,i 2 =220√2 sin (314t—120 O )A,试写出二者之和的幅值相量 的表达式:( )。A.
220 √2∠120°A
B.
220 ∠120°A
C.
220 √2∠-60°A
D.
220 ∠-60°A
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