级数
的收敛域为( )。
参考答案:C
解析: [*],当x=-2时,级数[*],发散,当x=2时,级数[*]发散,故原级数收敛域为(-2,2),故选(C) 。
The swimming pool is 80 meters _____ and 40 meters _______.
A.in long; in wide
B.in length; in width
C.long; in width
D.in length; wide
简述婴幼儿感知觉发展的一般特点。