Valid Visa Expired Passport....Can I still use the visa?

I have a L for china (2 visits) that is still valid, but I have had to renew my passport since it was issued....I want to go to China for a few days but am unsure if I can still use this entry permit. I looked on the web and it is a general convention that if you bring your expired passport with the valid entry permit (and your new passport) then you can still use the entry permit. I have searched the web and it seems that I can also do this for China, but just to be sure I want confirmation. Can anyone confirm this for me? Many thanks