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A two wire SYSTEM then requires two twisted pair, and a four wire SYSTEM requires three twisted pair. 一个二线制系统两个双绞双绞线对，一个四线制系统需要三个双绞线对。
It is widely interested how to construct an active power filter to suppress the harmonics in three phase four wire system. 三相四线制系统中如何使用有源电力滤波器来抑制线路中的谐波，这一问题越来越被人们所重视。
This paper analyses the reason that neutral current is not zero when linear three phase system load connects to three phase four wire system source in Y connection. The resolution is also given. 分析了线性三相对称负载Y联接在对称三相四线制电源时 ;中线电流不为零的原因 ;并给出了解决的方法 .
AC three phase four wire system with neutral earthed 中性点接地的交流三相四线系统
three phase four wire system 三相四线制
A new algorithm for random harmonic current detection based on ip-iq principle without phase lock loop in three phase four wire system 三相四线制任意次谐波电流的无锁相环ip-iq检测新方法
two phase four wire system 双两相四线制
three-phase four wire system [电] 三相四线系统
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Its formation and development experience three phrase such as latent,delomorphic,acute changeable.Its occurrence has such characteristics as fulminant,violent,heat,mixing,changeable and obstinate. 其形成与演变大体经历了隐匿态、显现态、极变态三期,其致病具有骤发性、酷烈性、火热性、兼夹性、善变性、顽固性等特点。
four wire system 四线系统
Figure 1 illustrates the concept of a multiplex wiring system. 图一表明多路传输接线系统的原理。
The structure and the component of an automotive electronic parking brake(EPB) by wire system are introduced. 论述了一种汽车线控驻车制动系统的基本结构、组成及功能。
High voltage current is usually carried by overhead wire system so as to prevent living things being electrocuted. 为防止人畜触电，高压电一般采用高架线传送。
A line of communication between two points in a telephone or similar wired system. 电讯线在电话或相类似的有线系统中两端之间的通讯线路
The use of the four wire method and the photoelectric segregation technology raises the test precision and disturbance resistibility. 采用四线法和光隔技术，提高了测试精度和系统的抗干扰能力。
In this dialogue, we heard three phrases: make a mistake, hide the mistake, correct the mistake. 在会话里，我们听到三个语词：犯错，掩盖错误，改正错误
A circuit arrangement for deriving a phantom circuit. In four wire circuits, the two wires associated with the "GO" channel form one "side circuit", and those associated with the "return" channel form another. 用来派生一个幻象电路的电路结构。在四线电路中，与“去程”通道相关联的两线就形成了一个“半边电路”, 而与“回程”通道相关联的两线构成了另一个“半边电路”。
The succession of decomposer fauna distinctly showed as three phrases compared to the three phrases of decomposition. 4.;分解过程中动物群落结构功能演替也呈现明显的阶段性。
Data transmission of mobile equipment taking radio communication as the main way is more weaker in security and reliability sides than wire system. 以无线通信为主要手段的移动设备数据传输,在安全性和可靠性方面比有线系统更为脆弱。