Exercises to answer, the password encoding learning and network security: Principles and Practice of the third edition, teaching materials supporting the answer. Suitable for beginners.
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answer to exercises 练习参考答案
The book also has a full answer key to all exercises.
这本书也有一个完整的答案主要向所有演习。
When you visit the gym, make sure there are staff members available to answer your questions, demonstrate exercises, or show you how to use the equipment.
当你到了一个健身房，要确保那里可以找到职员以便回答你的问题、做示范练习或者向你展示如何使用那些设备。
You can repeat exercises, answer the same questions, listen to the same sound files until you feel comfortable with them.
你可以重复练习，回答同样的问题，听同样的音频文件到觉得很顺耳为止。
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