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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:3 y. }2 N) }+ h# U8 f
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) C T: E& H5 Q0 }' Z$ w可能係3m/s吧............ 3 r+ R- d; v J/ u2 `. E- G, C: l
' Y/ z% h# |9 D( ^7 N* x2 C另外
7 n' X; Q3 l( f \! q; m; O/ ]1 U.S. survey mile (also called "statute mile") = 1 mi = 5280 ft. M' f4 J0 P+ L h4 A
1 international mile = 1 mi = 5280 ft6 E/ {, u( p( v6 Q7 }
1 ft = 0.3048 m
6 L$ u0 L2 A+ q8 ?; N5 g所以 1mi = 1.6km4 m# E _1 Q, ?
9 l- d4 u5 K) a3 I4 \4 Y* Wref: NIST |
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