Why can't I see Yi Bookstore?

Yi Bookstore can't stand it because it is under maintenance.

Easy Book Store app is a knowledge service platform dedicated to the study of Zhouyi, which provides a lot of knowledge and materials about Zhouyi to help you learn Zhouyi and understand the traditional fortune-telling knowledge in China. The operation is simple and easy to understand, which helps turn all misfortunes into blessings.

The e-book house aims to provide free learning materials for China mathematics learners and enthusiasts, and promote China culture. A large number of mathematical materials include techniques such as plum blossom easy number, six hexagrams, four pillars numerology, Wei Zi's number, Liu Ren's number, Daoism, Taiyi number, and Feng Shui theory. In order to facilitate reading, readers can collect interesting materials and store reading progress.

Application maintenance:

Software maintenance is a term in software engineering, which refers to the software modification to correct errors, improve performance or other attributes after the software product is released.

Software maintenance mainly refers to the partial or total modification of application programs according to the changes of requirements or hardware environment, and the source program should be fully utilized when modifying. After modification, fill in the Registration Form of Program Modification, and indicate the difference between the old and new programs in the Notice of Program Change.

Generally speaking, there are four types of software maintenance activities: corrective maintenance, adaptive maintenance, perfect maintenance or enhancement, preventive maintenance or re-engineering. In addition to these four types of maintenance activities, there are other types of maintenance activities, such as supporting maintenance (such as user training, etc. ).

For the above types of maintenance, some maintenance strategies can be adopted to control the maintenance cost.