能从字符串A="THIS_IS_BOOK"中得到子字符串"IS"的表达式有(
6 查阅
Right(Left(A,7),2)
Left(Right (A,7),2)
Mid(A,6,2)
Mid(Left(A,7),6,2)
Mid(Left(A,7),6)
参考答案:
Right(Left(A,7),2)
Left(Right (A,7),2)
Mid(A,6,2)
Mid(Left(A,7),6,2)
Mid(Left(A,7),6)
参考答案: