某乡镇有7个村A~G，各村间的道路和距离（单位：公里）如下图，乡政府决定在其中两村设立诊所，使这7村群众看病最方便（即最远的村去诊所的距离a最短）。经过计算，a=（ ）公里。
- A.3
- B.3.3
- C.4
- D.4.5
正确答案及解析
正确答案
解析
可将诊所设立在E、A/C两处，其中B-E（3公里）、D-E（3公里）、F-E（1.5公里）、F-E（3公里）、A-C（3公里）。最远去诊所的距离为3公里
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