Jia Chunhua 2021-06-28

May I ask if this journal charges a fee? It wasn't open access before, but is there a publication fee that needs to be paid by the author when submitting an article? Thank you for your reply.

Jia Chunhua 2021-06-28

Excuse me, is this journal charged? I noticed there is a page fee when submitting, do I need to pay for it myself? Please reply when you see this message, thank you very much!