对于复杂的计算机网络协议最好的组织方式是层次结构模型。我们将计算机网络层次结构模型和各层协议的集合定义为 【11】 。
参考答案：网络体系结构
He said he had stolen the money but he couldn't _____ the fact that the money was found in his house. [ ]
A. answer for
B. leave for
C. account for
D. care for
口腔全口义齿制作时使用的蜡属于
A．印模蜡
B．嵌体蜡
C．基托蜡
D．铸造蜡
E．黏蜡
