Logical cipher contactless ic card chip is the most current in the entire world and our country , so this design direction is it , and the algorithm of cipher adopt stream cipher corresponding and compatible with philips mifare card 非接触ic卡中逻辑加密型是目前世界和国内应用比较广泛的，故本设计的方向选择了非接触逻辑加密型ic卡，加密算法采用了和philips的mifare卡相兼容的流密码加密算法。
Therefore it is necessary to study on strategy of citrus industry structure in china which can set up the faith to face the market competition and develop our citrus production , supply the useful information for resources use , protection citrus production , raise fruit . quality and competition 2研究的理论依据、方法和主要内容2 1理论依据根据市场经济、产业经济、资源经济等经济学的基本原理与柑橘科学的特点、我国柑橘产业的现状和发展方向选择相结合。
Because the delivery study is a big issue , this dissertation only discusses about the delivery manner of wheat futures . it consists of five parts . part one points out the problems and shortcomings of the present delivery system , implying the necessity of the innovation of delivery manner ; part two introduces the management and operation of wheat futures delivery , nailing down the choice of innovation ; part three is the academic analysis , ensuring the principles of the delivery system projection ; part four is the feasibility of the innovation ; part five concludes with the expectation of the three innovative manners 论文共分为五个部分：第一部分指出现行小麦交割方式导致的问题，说明了进行交割方式创新的必要性；第二部分介绍了现行小麦交割方式的管理与运作，明确了进行交割方式创新的方向选择；第三部分是对交割方式设计的理论认识分析，界定了交割方式的设计原则；第四部分是对进行小麦交割方式创新的社会经济环境条件分析；第五部分对三种交割创新方式的发展前景进行了展望。
