关于沟通技巧方面的专业PPT，有很高的参考价值，对于售前、顾问等岗位-Professional communication skills on the PPT, a high reference value, for the pre-sales, consultancy and other posts

a book about computer

It s about how to study c++ about communication system. please check how to apply it to your communication programming. it is useful for who want to progress their skill about communication system coding. For instance, zigbee, bmac, zmac etc.