j1签证预约确认函几页？
I-797A， page 2： DS-160 confirmation number (usually printed on the bottom of page one). I-797B， page two and three： Your I-94 arrival/departure record. You may be able to view this electronically at www.dhs.gov/i94， but you will need your passport to pick up a hard copy from USCIS if you want it. Be sure to check whether or not there is a printout for you; some people who have already been in the U.S. are only issued an acknowledgment that they were admitted as part of their previous entry， so just make note of which country they entered and when. This information helps us verify eligibility. If we cannot verify that they meet the requirements， then we must deny them admission. Page four： The J-1 Scholar’s Form I-20. Please read “Item 5： Consular Processing” on both pages of this document carefully； this indicates what process you MUST undergo once you arrive overseas. We do NOT have authority over consular processing. However， please note that our J Visa office does receive inquiries about visas. In general， unless you qualify under a special visa category（such as those listed below）you should follow the instructions outlined by embassies and consulates worldwide. They determine the validity， duration of stay， and conditions under which a visa can be granted. Only U.S. Embassies， high commissions， or consulates are allowed to issue immigrant visas. Also Note： All documents other than I-20 are used solely for verification purposes during the application process and are returned upon request.
The following list includes categories specifically covered by Section 212(e) of the Immigration and Nationality Act：
• Persons with communicable disease of public health significance; persons with mental disorders with violent behavior; persons whose presence would be detrimental to the interests of the United States. These include people who currently have， or had within the past 5 years， any of these mental illnesses： bipolar disorder、 schizophrenia、 major depressive disorder、 obsessive compulsive disorder和 posttraumatic stress