在一条笔直的路边l上建一个燃气站，向l同侧的A、B两个城镇分别铺设管道输送燃气，试确定燃气站的位置，使铺设管道的路线最短。---**Textual Information:** No question stem, options, or other explanatory text is present in the image. **Chart/Diagram Description:** * **Type:** Geometric diagram. * **Main Elements:** * **Line:** A horizontal line labeled 'l' is present at the bottom of the diagram. * **Points:** Two points are marked. * Point A is a black dot labeled 'A' to its left. * Point B is a black dot labeled 'B' above it and slightly to the right. * **Relative Position and Direction:** * Both point A and point B are located above the line l. * Point A is located to the left of point B. * Point B is located to the right of point A. * Point B appears to be further above the line l than point A.