计算积分<img src="https://static.zxtiku.com/wangke/imgs/topic/97c573c19731c2a15c1b963e76639646.jpg"/>,其中C为从原点到点<img src="https://static.zxtiku.com/wangke/imgs/topic/e5e7a8307a65ec0d8d92c70c3e2e8e58.jpg"/>,再到<img src="https://static.zxtiku.com/wangke/imgs/topic/4f73631b45ad09d3ef7a54634942eea5.jpg"/>的折线段. A. <br/> 1 B. <br/> -<img src="https://static.zxtiku.com/wangke/imgs/topic/e5e7a8307a65ec0d8d92c70c3e2e8e58.jpg"/> C. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/e5e7a8307a65ec0d8d92c70c3e2e8e58.jpg"/> D. <br/> -1