Web services
参考答案：是描述一些操作的接口。Web services是用标准的、规范的XML概念描述的，称为Web services的服务描述。
In our childhood, we were often ___by Grandma to pay attention to our table manners
A. demanded b reminded C. allowed D. hoped
水的pH值小于4时,水中的碳酸化合物只有游离CO2,没有其它碳酸盐
