可以考虑做速度计Calibration。可能许用误差通常在5%。

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a systematic 5% off will be a big deal -lovecorn- 给 lovecorn 发送悄悄话 lovecorn 的博客首页 (0 bytes) () 11/19/2010 postreply 23:02:46

As of 97, Federal standards in the United States allowed a maxim -00zz7788- 给 00zz7788 发送悄悄话 (186 bytes) () 11/20/2010 postreply 12:18:07

per "Auto Tutor", American Automobile Association of California -00zz7788- 给 00zz7788 发送悄悄话 (94 bytes) () 11/20/2010 postreply 12:21:46

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