国际单位制中,时间的单位是 ____,符号 ____ 表示.
如图,在函数y1=k1x(x<0)和y2=k2x(x>0)的图象上,分别有A、B两点,若AB∥x轴,交y轴于点C,且OA⊥OB,S△AOC=32,S△BOC=272,则线段AB的长度是( )
完形填空
Hello! My 1 is Jim Smith. My first name is 2, and Smith is my 3 name.4am 5 English boy. What's that over there? Oh, it's my 6. It's an 7 dictionary. I like8 very much. 9 is it? It's red. Can you 10 dictionary? Yes, D-I-C-T-I-O-N-A-R-Y.
浣溪沙
欧阳修①
堤上游人逐画船,拍堤春水四垂天②。绿杨楼外出秋千。
白发戴花君莫笑,六幺③催拍盏频传。人生何处似樽前!
【注】①欧阳修早年被贬颍州,晚年又隐居于此,颍州城西北,有一天然水泊,人称西湖,风景优美,是当时的名胜之地。欧阳修常来此游览。②四垂天,天幕从四面下垂。③六幺,为唐代琵琶曲名。白居易《琵琶行》:“轻拢慢捻抹复挑,初为《霓裳》后《六幺》。”