I am a monopoly inkjet printer shop boss, to be honest, I don’t know what is the working principle of inkjet printer, there are a lot of customers want to buy our inkjet printer, but the principle of work as long as the consulting my inkjet printer, I will suffer in silence the said does not export, so therefore I also dedicated to our supplier to a book about inkjet printer’s structure and working principle, interpretation of the book, now, if a customer to send me the news about inkjet printer all problems, I can be selfsufficient, because I now what will, can solve all the problems of customer proposed, so I shop business is getting better and better.