已知向量<img src="https://static.zxtiku.com/wangke/imgs/topic/76a91420a7ce860aac81da12f934b608.jpg"/>,则<img src="https://static.pphuashu.com/wangke/imgs/topic/5fe35c732916e851207e2efb465c8578.jpg.png"/>的夹角及<img src="https://static.zxtiku.com/wangke/imgs/topic/2ca335b1df8072a35b2a99654b6becbc.jpg"/>在<img src="https://static.zxtiku.com/wangke/imgs/topic/bc22a0a454c121fca6c3486c1bf0d9cf.jpg"/>上的投影( ) A. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/5cc85918bbec30d9718c166f18d1746f.jpg"/> B. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/357d12c6e87cbf581cd883fefd8c5461.jpg"/> C. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/c705dae2d6a0189768e2a951769fd8d0.jpg"/> D. <br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/8a32f229b019459f2f0a12f37fd37ed7.jpg"/>