回复：最近加拿大移民，有谁去过底特律面试?

I went there for interview before. You will know if your spouse will go with you for interview in next letter from Detroit Consulate. As for the interview procedures, the visa office will ask you some information about your previous work experiences. Be prepared. You can get more information about your job descriptions from NOC. http://www23.hrdc-drhc.gc.ca/2001/e/generic/welcome.shtml
Good luck.