关于召开第二届全国公路养护新材料应用技术大会通知
??????? ????? ??????? ??? ??????? ?? ????? ?? ??? ???? ??????? ??? ????? ????????? ????? ????? ?????? ?? ???? ?? ???? ???? ????????? ?????? ??? ????????? ????????? ?????? ?? 1872 ??? ??????? ???? ??? ??, ?? ???? 2.2 ?????? ???? ?? ????? ????? ??? ???? ??? ??? ????????? ????????? ?????? ???? ?????? ????, ?? ?????? ??????????? ???????? ?? ??? ??????? ?? ???? ???????? ????? ??? ???? ??? ?????????? ?? ??? ???? ?? ????????? ????????? ?????? ???????? ???? ????, ????? ?????, ???????? ???? ?? ???? ???? ??? ?????????? ?? ????? ???? ??? ???? ????? ????????? ????????, ????? ???? ?? ?????? ?? ?????? ???? ????????? ????? ????? ?? ?????? ?????? ??, ?? ?? ??? ???? 4.1 ?????? ???????? ?? ??????? ???? ??????????? ??? ?? ????????? ????? ????? ?? 19 ??? ??????? (?? 1872) ?? ??? ??? ???? ??? ??? ????? ?? 1972 ???, ?? ??????? ?? ?? ???????? ????????? ?????? ??????? ?? ??? ??? ??????? ???? ??? ???[1][2][3]
????????? ????? ????? ?? ??????
[??????? ????]??????? ????? ??????? ?? ???? ?????? ???? ??? ???? ????????? ????? ????? ?? ?? ?? ????? ???? ?? ??????? ????????? ?? ?? ??? ??? ????? ???? ??? ?? ????? ???? 11,000 ??? ???? ???? ????????? ?? ????? ?? ???? ?????? ?? ?? ???? ???????? ??????[4]
????????? ????? ????? ?? ???? ???
[??????? ????]????????? ????????? ?????? ??? ?? ????? ????, ???? ?? ?????? ???, ????????? ???, ???, ??????? ????, ???? ???????, ?? ???? ???? ??? ?????????? ?? ??? ???? ???? ????? ??????? ????? ??????? ??? ???? ?????? ?? ???? ???? ????? ???? ?? ?? ??? ??????? ???????????? ?? ??? ????? ???? ???? ?????? ??? ???? ???? ?????? ????????? ????????? ?????? ?? ?????? ?? ?????-????? ???, ????? ?????? ?? ???? ?? ??? ???? ????[5][6]
???????
[??????? ????]- ↑ "Yellowstone National Park". whc.unesco.org.
- ↑ "Yellowstone National Park: Its Exploration and Establishment (Part I)". www.cr.nps.gov. ??? ?? ?? 15 ??????? 2006 ?? ??????????. ?????? ????: 18 ????? 2025.
- ↑ Temple, Bob (2007). Welcome to Yellowstone National Park. Mankato, MN: Childs World. ISBN 9781503823464.
- ↑ "Ferdinand Hayden and the Founding of Yellowstone National Park | U.S. Geological Survey". www.usgs.gov.
- ↑ World, Beautiful (6 ?????? 2018). "Yellowstone National Park Facts & Information - Beautiful World Travel Guide". Facts & Information - Beautiful World Travel Guide.
- ↑ Park, Mailing Address: PO Box 168 Yellowstone National; Us, WY 82190-0168 Phone: 307-344-7381 Contact. "Mammals - Yellowstone National Park (U.S. National Park Service)". www.nps.gov (????????? ???? ???).
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