每对同位角都在截线的___同旁_____,又都在两条被截直线的___同侧______;
每对内错角在截线的___两旁______,在两条被截直线的___内侧______;
每对同旁内角在截线的____同旁_____,在两条被截直线的_____内侧____.
每对同位角都在截线的___同旁_____,又都在两条被截直线的___同侧______;
每对内错角在截线的___两旁______,在两条被截直线的___内侧______;
每对同旁内角在截线的____同旁_____,在两条被截直线的_____内侧____.