If you can't make an appointment, it means you can't check out Chinese books, so you can only read them in the library. Some rare books, ancient books and reference books are not allowed to be lent out. But you can read it in the library and copy it in the library (of course, whether a book can be copied depends on its preciousness. If it is a rare book, you can only look at its microfilm or electronic version. Copying has a great influence on the life of paper.
In fact, all the questions you encounter above need only go to the information desk of the library for consultation, and you will get satisfactory answers. And the staff will give you advice and try to get relevant services for you.
Try it!