已知两正弦量,U<SUB>1</SUB>=20sin(ωt+π/6),U<SUB>2</SUB>=40sin(ωt-π/3),则U<SUB>1</SUB>比U<SUB>2</SUB>(____)。
A超前30°
B滞后30°
C滞后90°
D超前90°
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