A:I'm going to have a picnic.
B:I often have a picnic with Ann.
C:I had a picnic last Friday.
人体从外界获得信息,最主要来源于视觉,其次是听觉,请根据所学知识,回答相关问题:
已知抛物线y1=a1x2+b1x+c1,y2=a2x2+b2x+c2,且满足a1a2=b1b2=c1c2=k(k≠0,1).则称抛物线y1,y2互为“友好抛物线”,则下列关于“友好抛物线”的说法不正确的是( )
光明学校文学社决定举办“我爱祖国文学”为主题的读书报告会,现请你参与完成以下几项工作: