• 2022-06-06
    [img src="http://edu-image.nosdn.127.net/CA283CAEBC4FD5FCF10C64A8835CC6A2.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]
    A: -0.5m/s
    B: 0.5m/s
    C: -6m/s
    D: 6m/s
  • 举一反三