A content delivery system includes a delivery server, a storage apparatus having a logical unit for storing data regarding content items, and a management apparatus having a content management unit for managing a delivery server. The liquid container is constructed such that pressurized fluid is sent to its inside so that the liquid in the inside is delivered to the outside. Each of the operative ends includes a substantially smooth and continuous surface thereon. One of the electrode portions is formed on one side of the surfaces of the land sheet to be contacted and electrically connected to a terminal of the electrical part, and the other one thereof is formed on the other one side of the surfaces of the land sheet to be contacted and electrically connected to the conductive portion of the contact sheet.