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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:
7 D, l P) @3 a4 ?/ H8 L3 d
5 i& q- F8 g; L+ Y# h
. y2 ~ [& o4 L6 I6 c6 k; R1 G可能係3m/s吧............ 1 ^/ F5 q0 Z9 S7 _8 v
3 r+ T. {# r1 H- D$ `, v另外
4 X5 r) C/ `4 e7 I, `* `7 o- k1 U.S. survey mile (also called "statute mile") = 1 mi = 5280 ft
# i& e+ A1 A2 Z# _, M# n+ z1 international mile = 1 mi = 5280 ft( `6 G, ^% t0 Z' T% ], N( ^9 g; G+ ^" f
1 ft = 0.3048 m1 E) d0 B6 k, L! Z9 u0 z
所以 1mi = 1.6km
+ V$ N$ V1 p5 w. o( S# G5 G% B' C( n7 F
ref: NIST |
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