送交者: cornbug 于 2012-01-08, 14:36:26:

回答: 从a城到b城的距离是直线还是弧线？ 由 cornbug 于 2012-01-08, 12:27:47:

• it is always a curve. (无内容) - steven (0 bytes) 2012-01-09, 14:38:55 (640703)
  • 概念不清，距离怎么会是线呢？ (无内容) - 008 (0 bytes) 2012-01-09, 23:59:27 (640728)
• very good question. That's where modern geometry started. (无内容) - 008 (0 bytes) 2012-01-09, 01:54:40 (640678)

加跟贴