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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:
) X( I7 ~9 z4 N# Y
1 U7 m" X6 d- Y
; [+ c% P4 A! V6 [5 h& U8 M可能係3m/s吧............ , K* A, N1 H0 Y3 Q- B4 v3 y# K) B, W8 ^& ^, z; x% w0 S" X1 \
另外
: Z: q7 S; D& ~1 U.S. survey mile (also called "statute mile") = 1 mi = 5280 ft
7 o# k5 ]4 s/ v6 |- A% F2 H1 international mile = 1 mi = 5280 ft
, C$ |% K. h3 y6 F0 F" M3 _2 g1 ft = 0.3048 m
' J, l* ^- f7 i所以 1mi = 1.6km
2 u! w3 }; h. K* q4 N' w/ e% L& S) |& K5 ?# g+ z Y) I( H5 J
ref: NIST |
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