This book will show you ________ can be used in other contexts.

A．how you have observed

B．how what you have observed

C．that you have observed

D．how that you have observed

Microsoft网络模型包括7个层次，其中文件系统接口层的定义作用为( )。

A．提供“路径切换”

B．可将API调用翻译为计算机可理解的语言

C．用户应用程序在该层进行API调用

D．运行网卡所带的软件驱动程序