下面关于串的的叙述中,哪一个是不正确的:Which of the following descriptions about string is not correct? (There is only one correct answer)()
A.串是字符的有限序列 String is a finite sequence of characters B.模式匹配是串的一种重要运算 Pattern matching is an important operation C.串是一种数据对象和操作都特殊的线性表 String is a linear list whose data objects and operations both special D.空串是由空格构成的串 Empty string is a string consisting of spaces