（）是SDH为适应数据业务交换需求而进行扩展的一项技术，能够在一个多业务平台上，有效地支持数据、语音和图像业务交换。
参考答案：MSTP
The bread my wife makes is much better than ____ you can buy at a store. [ ]
A. that which
B. one that
C. that of which
D. this of which
简述保险的宏观作用
