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感谢: LAMOST 4000 fibers Spectral resolution: R=1800 Site: 250km from Beijing; 950m above the sea; 2-3arcsecs seeing; Sky brightness of 20.5-21.5mag/arcsec2,1、LAMOST与类星体巡天,MB mirror,Fiber Positioning,Fibers,MA mirror,Spectrographs CCDs,大视场：5度 多光纤：4000根,郭守敬望远镜,Ma: reflecting corrector (24 sub-mirrors) 4.9m Mb: spherical mirror (37 sub-mirrors) 6.1m,4000 optical fibers,