i want to visit China need single entry visit visa.

Dear Sir/Madum
I am a Pakistani citizen having Pakistani passport doing business in Moscow,Russia for last 3 years i have residence permit which will be expired on November 28 ,2013 this will be renewed before expire ,i visited China in Canton Fair at Guangzhou this year in first week of May 2013 ,now again i want to visit Guangzhou to meet some customers as i am buying textile raw material from China ,please advise if i can get single entry Chinese one in Moscow ,please note i got USA 5 year multiple one in Moscow last year too. I can provide round trip ticket with hotel reservations along with application.please advise
Best regards
Syed Tariq Ali