【英语翻译唐代书家之盛,不减于晋,固由接武六朝,家传世习,自易为工,而考之于史,唐之国学凡六,其五曰书学,置书学博士.学书日纸一幅,是以书为教也.又唐铨选择人之法有四,其三曰书,楷法遒美】
已知三角形ABC中,点A(3,0),B(0,3),C(rcosα,rsinα)(r大于0)(1)若r=1,且AC*BC(都是向量)=-1,求sin2α的值(2)若r=3,且∠ABC=60°,求AC的长度
whatthreecomponents,generally,makeupasystemoftypicallanguage?a.phonology,syntax,semanticsb.semiosis,syntax,framesc.frames,semantics,utterancesd.sign,sign,signs