单项选择题
A.UGR=10B.UGR=19C.UGR=22D.UGR=25
A.x=0.333,y=0.333B.x=0.346,y=0.359C.x=0.380,y=0.380D.x=0.313,y=0.337
A.1SDCMB.3SDCMC.5-7SDCMD.10SDCM
A.500lxB.1000lxC.1500lxD.200lx
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