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1)  1st class or 2nd class control
一、二级控制
1.
This paper sets forth the surveying method,technique requirement and the notice matters in 1st class or 2nd class control survey by means of the double basic stations GPS-RTK,and demonstrates the feasibility of the method through actual example,finally,gets a conclusion that this method could enhance greatly working efficiency.
阐述了利用双基站GPS-RTK进行一、二级控制测量的方法、技术要求和注意事项,并通过实例论证了利用双基站GPS-RTK进行一、二级控制测量的可行性,最后得出利用该方法可大大提高工作效率的结论。
2)  primary and secondary control
一级与二级控制
1.
Furthermore,the writers considered that the heating process is vital to the production and the primary and secondary control must be strengthen.
介绍了我国不锈钢行业近年的发展状况,基于生产实践经验,分别从原料、设备结构、电气、板坯布料等方面研究并探讨了不锈钢生产中应注意的事项,提出必须加强不锈钢加热过程中的一级与二级控制[1]。
3)  primary control
一级控制
1.
In the light of control, individuals’behaviors can be categorized into primary control and secondary control.
从控制的角度看,行为可以分为一级控制与二级控制。
4)  secondary control
二级控制
1.
Result shows that efficacy and validity of the instrument in structure,discrimination,internal and half-split reliability prove sound enough;the examinees control beliefs are better than theoretical average,secondary control better than the primary.
以518名普通高中和职业高中青少年为被试,探讨了中文版控制信念量表的信度和效度以及我国青少年初级和二级控制信念的发展状况。
2.
This paper focused on the central concepts of the life-span theory: primary control and secondary control, the function of them, the relationship between them, and related researches and argument.
本文详细介绍了终生控制理论的核心概念 :初级控制和二级控制、二者的功能及相互关系 ,以及有关研究与争
3.
In the light of control, individuals’behaviors can be categorized into primary control and secondary control.
从控制的角度看,行为可以分为一级控制与二级控制。
5)  two stage control of microcomputer
微机二级控制
6)  distributed secondary control
分布式二级控制
1.
Aiming at the new mode of dispatching and monitoring,we suggest a reactive power and voltage distributed control strategy in regional grid,which adopts distributed technology and hybrid optimization technology and enlarges traditional centralized control system into distributed secondary control.
该控制策略采用分布式技术及混合优化技术,将传统的集中控制系统扩展为分布式二级控制。
补充资料:超导体的一级和二级相变(firstorderandsecondorderphasetransitionsinsuperconductors)
超导体的一级和二级相变(firstorderandsecondorderphasetransitionsinsuperconductors)

按热力学理论上对相变的分类,在相变处两相化学势相等,但一阶导数不等,因此有相变潜热发生,称一级相变;若一阶导数也相等,但二阶导数不等,则相变处有比热跃变等,但无潜热,称二级相变。实验和理论均显示,无外磁场的超导体,在临界温度Tc处发生的超导-正常相变比热有跃变,属二级相变。存在外磁场H中的第一类超导体,在H=Hc发生的相变有潜热发生,属一级相变,但伴随着迈斯纳效应,体内磁感应B=Bc(或原先B=0)突发性地变为B=0(或B=Bc)。对处于外磁场中的第二类超导体,当H增加到Hc1相变时,有一个(或极其少量)磁通线穿透样品,H继续增加,穿透进入样品的磁通线数量逐渐增多,体内场强也增大,到H=Hc2相变开始转入正常态时,体内B=Bc2。这与第一类超导体H=Hc时的突发性过程不同,这里是渐变过程,反过程(也包括有磁滞的硬超导体)也是渐变的。这里在H=Hc1,H=Hc2的相变无潜热,但比热有跃变时,属二级相变。

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