面向数据的设计方法适用场合是具有明显的层次信息结构的应用如：企事业的信息管理系统；系统软件（如操作系统）等。
参考答案：对
Marginal benefit is most accurately described as the:（）
A. benefit from producing one more unit of a good or service.
B. benefit an individual gets from consuming an additional unit of a good or service.
C. benefit that must be forgone in order to consume an additional unit of a good or service.
叶片拉筋的焊接顺序是：如果一级上有几排拉筋，先以内圈焊起，而在一排内首先焊各组的第一片，然后焊各组的第二片，依次到各组的最后一片
