18.The non-statutory computer-readable storage medium of claim 15, further comprising:initiating the IM session for a domain associated with said page, 19.The non-statutory computer-readable storage medium of claim 15, wherein said domain IM session enables each user on a page within said domai...
下列推理是归纳推理的是( ) A. A.B为定点.动点P满足|PA|+|PB|=2a>|AB|.得P的轨迹为椭圆 B. 由a1=1.an=3n-1.求出S1.S2.S3.猜想出数列的前n项和Sn的表达式 C. 由圆x2+y2=r2的面积πr2.猜出椭圆+=1的面积S=πab D. 科学家利用鱼的沉浮原理制造潜艇