某企业管理信息系统中，采购子系统根据材料价格、数量等信息计算采购的金额，并给财务子系统传递采购金额、收款方和采购日期等信息，则这两个子系统之间的耦合类型为（ ）耦合。
- A.数据
- B.标记
- C.控制
- D.外部
正确答案及解析
正确答案
解析
非直接耦合：两个模块之间没有直接关系，它们之间的联系完全是通过主模块的控制和调用来实现的。
数据耦合：一个模块访问另一个模块时，彼此之间是通过简单数据参数（不是控制参数、公共数据结构或外部变量）来交换输入、输出信息的。
标记耦合：一组模块通过参数表传递记录信息，就是标记耦合。这个记录是某一数据结构的子结构，而不是简单变量。其实传递的是这个数据结构的地址；
控制耦合：如果一个模块通过传送开关、标志、名字等控制信息，明显地控制选择另一模块的功能，就是控制耦合。
外部耦合：一组模块都访问同一全局简单变量而不是同一全局数据结构，而且不是通过参数表传递该全局变量的信息，则称之为外部耦合。
公共耦合：若一组模块都访问同一个公共数据环境，则它们之间的耦合就称为公共耦合。公共的数据环境可以是全局数据结构、共享的通信区、内存的公共覆盖区等。
内容耦合：如果发生下列情形，两个模块之间就发生了内容耦合
（1）一个模块直接访问另一个模块的内部数据；
（2）一个模块不通过正常入口转到另一模块内部；
（3）两个模块有一部分程序代码重叠（只可能出现在汇编语言中）；
（4）一个模块有多个入口。
根据本题题干描述，采购子系统“给财务子系统传递采购金额、收款方和采购日期等信息”，传递时应将这些数据包装在数据结构中，因此二者之间是标记耦合。
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