-Yes, but Most likey the application will have no I-94 card and thus, you need to go out o U.S. to get an H1 visa to activate your H1 status.
2)要出境申请h1b visa 的话,是不是可以去墨西哥或者加拿大呢?
-Yes
3)如果一定要回中国签证,可否可以不在户口所在地所属的领馆申请,因为时间紧急,想着哪个领馆能预约上就去哪儿签。
-Yes, any U.S. Consultes in China will be OK.
还有这种情况可以去美国驻香港领馆签吗?
-Yes
刚才公司的hr lady打电话来说,律师希望我尽快离境去签证,我和她说我必须等到h1b transfer approve后发给我新的I-797才可以走,因为没有I-797number,我连签证预约都没法约,大家说我给的这个理由充分吗?
-You are right. You had better get the approval notice beore you leave U.S. If you are lucky to get the I-94 with your approval notice, you do not need to go out o U.S. and just go to work directly. Anyway, you had better use premium processing to get the H1 transfer petition approved within 15 days.