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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:
% y( u( q) B7 j
2 k- n- b% x6 R6 M" d0 N3 ]
: v: b. ~- B4 w# X4 B3 N! a0 J可能係3m/s吧............ " S1 x0 a7 W5 O
3 q& C+ F' k5 S6 _另外, l. j+ w* |/ @: W% P" X% E
1 U.S. survey mile (also called "statute mile") = 1 mi = 5280 ft
! x% M% M% D: ~% a9 E; f, X3 ?, H1 international mile = 1 mi = 5280 ft
7 j1 {. g' k, I \5 r4 N: U1 ft = 0.3048 m
: U0 a2 u3 ~3 C' n所以 1mi = 1.6km
# ~! O) n0 a) y, M* p6 K) U K* |+ F/ K! y! W. Y/ B
ref: NIST |
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