about O-1 visa

來源: 於 2008-04-03 04:02:52 [舊帖] [給我悄悄話] 本文已被閱讀：次

What is the difference between O-1 and H1b visa?
The O-1 visa will last how long?
How many times can O-1 visa be renewed?
How easy switch O-1 to other visa types?
Any further information?
Thanks in advance.