Major changes in tractor design include the power takeoff, the all-purpose or tricycle-type tractor, which enabled farmers to cultivate planted crops mechanically;
拖拉机设计的主要改变包括有动力输出装置，以及多用式或三轮型拖拉机的出现，这使农户实现机械化培育作物；
The design of an advanced control system to enhance the power system stability margin so as to achieve higher transfer limits is one of the major problems in the study of power systems.
因而，设计先进的控制系统，在提高电网传输能力的同时保证足够的稳定裕度成为电力系统的重要研究课题之一。
This paper introduces the functions, database system design, and the major features of fuel management MIS for thermal power plant.
介绍了火电厂燃料管理信息系统的功能设置、数据库体系设计与主要特点。
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