嵌入式系统中按照总线所传送的信息类型，可以分为（）；（）和控制总线等几种。
参考答案：数据总线、地址总线
台湾问题是中美关系中最核心、最敏感的问题。中美三个联合公报是两国关系健康、稳定发展的基础，这三个公报是：（）、（）和“八一七公报”。
After he has written his paper, he found some additional material______he should have included.
A．that
B．of which
C．in which
D．whom
