U<sub>1</sub>=100sin(314t+120°)V,U<sub>2</sub>=50sin(314t-90°)V,则U<sub>1</sub>与U<sub>2</sub>的关系是( )。
AA-U<sub>1</sub>滞后U<sub>2</sub> 210°
BB-U<sub>1</sub>滞后U<sub>2</sub> 30°
CC-U<sub>1</sub>超前U<sub>2</sub> 210°
DD-U<sub>1</sub>超前U<sub>2</sub> 30°
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