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【单选题】
正弦交流电压的有效值为220V,ψ=90°,下列各式中正确的是( )。A.
u =220 sin (ωt+90°)V;
B.
=220 sin (ωt+90°)V;
C.
=220 ∠90°V。
D.
= 220 sin (ωt+90°)V;
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