Second A hospital health care than the three A's?

Second A in general is not as good as the three A hospitals, such as input, medical resources, beds, equipment, especially clinical experience, three A usually have patients from all over the province and the provinces, while the second A is usually very few, the regional ratio is obvious, so the clinical experience is not so rich, some diseases, some surgery have not seen, dealt with. Of course, this is not absolute, there are many three A is also upgraded from the two A, today or two A, tomorrow may be three A.