<img src="https://static.zxtiku.com/wangke/imgs/topic/af3d57a3d45c17f8df8b3c61b09fe96f.jpg"/>的每一个顶点（即<img src="https://static.zxtiku.com/wangke/imgs/topic/51f0435c5f05fbe72a39e517bfe9b46e.jpg"/>)最多只能为( )个<img src="https://static.zxtiku.com/wangke/imgs/topic/af3d57a3d45c17f8df8b3c61b09fe96f.jpg"/>所共用。 <p> A. 2 </p> <p> B. 3 </p> <p> C. 4 </p> <p> D. 5 </p>