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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:, H, ]$ \* ^ {* f" @
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可能係3m/s吧............ $ S# ]7 Y2 Y8 z" ^4 s
, K, r8 a, j. q0 o; s/ U另外
" C6 f( L1 a( b4 Q8 d1 U.S. survey mile (also called "statute mile") = 1 mi = 5280 ft
4 x1 R& p5 j' n( e1 international mile = 1 mi = 5280 ft; k( \ a/ l( g2 O, H& J b2 L0 p
1 ft = 0.3048 m
# d4 G9 N" X3 A u- O所以 1mi = 1.6km
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ref: NIST |
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