正弦交流电压的波形图如图所示，该电压的时域解析表达式为（　　）。题82图

A、<img width="151" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/d036a877-7ba3-4a77-b3db-cb34806e4a76.png" />°）V

B、<img width="172" height="25" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/367024bf-f194-4bcb-92ed-536c8eea99b1.png" />°）V

C、<img width="165" height="25" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/9237d8f9-59bb-4c67-a892-170772191316.png" />°）V

D、<img width="164" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/b39d96cc-62df-418c-a971-9148529ca4d9.png" />°）V