Hi Dear,
I am Pakistani, Scholarship Student(PHD)in Nanjing, Jiangsu, China. I have X Visa and residence permit for about 4 years i.e., 2010-2014. I married in June 2010 in Pakistan with a Pakistani National.I wanna invite my wife here in China and wish she could stay with me as long as possible. I have two major issues.

1)What's the procedure to validate/get attested marriage certificate.
2) Which type of visa, maximum days of stay and number of entries i should ask for while filling the visa application form.
Kind and timely help will be highly appreciated.
Regards!!!!!