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p???????????????????????????????????? ??????????????? ???? ?????????????????????????????????????? ???????????????????????11-1 1 ???? ??? ? ? ?? ? ?? 1/2 ?()?()? 1/4 ?()?() 1/8 ? ?????????????????????????????????????????????56??????????????????abcdehsfgm??????????????abcd?????????????????????????11-2 2 ??? ?? ? ? ? 1:11,800 1:1,500 7.8 ?? 1:14,500 1:1,700 8.5 ??? 1:23,000 1:2,200 10.5 ? 1:32,000 1:2,600 12.2 ?? 1:40,000 1:3,600 13.5 ??? 1:73,000 1:4,100 17.9 ?? 1:77,000 1:4,200 18.3...
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??? 2010-11-17 17:29 ??????????????
??? 2010-11-17 17:29 ??????????????