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14#
發表於 2007-9-2 12:37 AM
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Originally posted by alienck at 2007-9-2 12:32 AM:( l8 N! l: e& s
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可能係3m/s吧............ $ l: O1 O7 g' j1 @
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1 U.S. survey mile (also called "statute mile") = 1 mi = 5280 ft
$ j! Q0 X# N0 z% s1 international mile = 1 mi = 5280 ft& f: J& l2 D* x" V% H" w
1 ft = 0.3048 m8 O/ V* @( Q9 u- O7 C) E' P
所以 1mi = 1.6km, O9 _ {. k, r5 f2 U' r7 b4 E) b
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ref: NIST |
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