No, it's not very convenient to consult reference books. It is related to the imperfect function of e-book production and needs to be improved. There are too many books and a lot of interference. Sometimes you can't concentrate on reading. Always attracted by other books. Advantages become disadvantages. Some can comment, others can't. Due to the advantages and disadvantages of different formats, the pdf format is too large, and the txt format has many errors and omissions, which need to be improved.

In a word, e-books have many advantages.

Books such as teaching read like other books. As long as someone makes it. Moreover, flat-panel lectures are also good, and reference books are all in one hand. Take a tablet to the world.