题目内容

网络系统集成的概念含有三个层次，即（）、（）、（）。

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层次化网络设计模型，可以把网络分为3个功能层次，分别是（）、（）和（）。

{ 请简述控制器让一个DS18B20进行一次温度的转换的基本操作。}{

Many books on science _____ since I went to college.

A. were bought
B. have been bought
C. will be bought
D. are bought

A beautiful picture ____ the children in the classroom.

A. was shown to
B. was shown
C. were shown to
D. were shown