<SDH原理培训手册>对SDH学习的初学者帮助很大！对SDH原理及实现讲的非常详细！也很容易拢懂！还有课后习题与参考答案！对知识有很好的巩固作用！最后祝各位学习愉快！-<SDH原理培训手册> Of SDH of the study is very helpful for beginners! Principle and Realization of SDH speak in great detail! Together is also very easy to understand! There are after-school exercise and reference the answer! Of knowledge has a very good role in the consolidation! Finally wish you all a happy studying!