1. Harmonic sources are classified into two kinds: current type harmonic source and voltage type harmonic source and the physical essential of the two kinds of harmonic sources is analyzed. 通过仿真解释了两种典型的谐波源的物理本质和分类依据。
2. Harmonic sources are classified into two kinds: current type harmonic source and voltage type harmonic source and the physical essential of the two kinds of harmonic sources is analyzed. 通过仿真解释了两种典型的谐波源的物理本质和分类依据。
3. Some basic concepts, such as definition inharmonic, the sorts of harmonic source, the distribution of harmonic in different fields and the harm of harmonic are firstly introduced in chapter 2. 论文首先阐述了谐波的定义、谐波源的分类与行业分布及谐波的危害，由此指出了研究谐波问题的必要性和紧迫性；
4. The harmonic suppression were expounded in detail from two aspects, one is the non-linear load producing the harmonic and another is the electrical equipments to be affected by the harmonic. 从产生谐波的非线性负荷以及受危害的电力设备和装置两个方面对谐波治理进行了详细介绍。
5. The most common ways are to specify Harmonic Distortion, Total Harmonic Distortion (THD), or Total Harmonic Distortion Plus Noise (THD + N). 最通用的方法是指明谐波失真，总体谐波失真（THD），或总体谐波失真加噪声（THD+N）。
网络释义
above all first first of all firstly for one thing in the first instance in the first place 首先;
above all first first of all firstly for one thing in the first instance in the first place 首先;
