Printing knowledge. What is positive and negative version, left and right wheels, and world round? Positive and negative version: a single card has two sides AB, A and B, each row a separate version for the positive and negative version; left and right wheels: A total discharge of a left and right version B for left and right wheels; World Wheel: A row under the co-B a version of the world round; or: Version 1 pros say two deputy version of the child, a pair are positive, and vice versa .... about 2 wheels, also called self replica pair version of the child Phuket printing quotes, turn the paper around . 3. The world round, up and down to make the paper seams, a positive and negative upper and lower row, head to head or feet on the foot. Shenzhen printing habit of saying, if the imposition is the pros and cons of India, since the turn over, roll turning distinction. Shenzhen Mayor David Printing Co., Mission: Your one-stop printing suppliers! Our philosophy is: "Sincerity-oriented, people-first." We always thought that the definition of a successful design and printing color pages in Shenzhen, is a long-term stable quality principles and honesty of others, rather than temporary bargain! I believe that with us, your business operating costs will be better controlled. Shenzhen Mayor David Printing Co., Ltd. is a design, printing, finishing as one of the modern printing and packaging manufacturer, welcome to buy! Bagualing printing company, long hung printing (certified), printed by Shenzhen Mayor David Printing Limited. "Album, tag, bag, box" Preferred Printing Co., Ltd. Shenzhen Mayor David (2), the company is located at: Room 1108, Shenzhen Fuminglulei deep Building, Futian District, over the years, long hung printing to provide customers with the most quality of service, Contact: Mr. Liu. Welcome to the new and old customers call, letter, visit the guide, business negotiations. David Printing expect to be your long term partner!