查询词典 make a circle

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

Again, position it over the second circle, select both shapes, click the large circle and align to vertical center.

同样放置在第二圈上，选择两个形状，单击大圆圈，垂直中心对齐。

The part of the Earth's surface between the Arctic Circle and the Tropic of Cancer or between the Antarctic Circle and the Tropic of Capricorn; characterized by temperate climate.

地球上两个地区之一，位于北极圈和北回归线之间或南极圈和南回归线之间；以温和的气候为特征。

The part ''.'of'.'' the Earth's surface between the Arctic Circle and the ''.'Tropic'.''''.'of'.''''.'Cancer'.'' or between the Antarctic Circle and the ''.'Tropic'.''''.

地球上两个地区之一，位于北极圈和北回归线之间或南极圈和南回归线之间；以温和''。

Nobody knows why, but the paint on the floor formed an arc of a circle (a centre of the circle lies inside the hall).

也不知道为什么。地板上的油漆构成了一个圆弧。

To further understand the concept of a circle, distinguish the perimeter and the area of a circle..

进一步熟记圆的概念，区分圆的周长和面积。

Further study the names of all the parts of a circle and how to work out the perimeter and the area of a circle.

复习圆的有关知识，进一步熟悉了圆各部分的名称，以及圆周长和面积的计算方法。

Student: The size of the plane which a circle occupies is called the area of a circle.

生：圆所占平面大小叫做圆的面积。

Calculated area of circle, a numerical input, press the button will get a corresponding area of circle.

详细说明：计算圆面积，输入一个数值，按按钮就会得到相应的圆面积。

The method of area ratio,the area of a circle in sample plot to the whole area of the circle, in which the distributing point is the center and the scale distance is the radius,is defined as the weighted coefficient of edge correction in this paper.

将边缘效应的权重值定义为以分布点为圆心，尺度距离为半径作圆，圆在样地内的面积部分与整个圆面积之比。

A small, rubber-headed hammer used in examination or diagnosis by percussion.

叩诊槌用在通过''。'振荡'。''所作的检查或诊断中的橡皮头的''。'小'。''槌

Affixes are limited in number in a language, and are generally classified into three subtypes, namely, prefix, suffix, and infix, depending on their position with reference to the root or stem of the word.

语言中词缀的数量总是有限的，根据它们跟词根或词干的相对位置，一般可以把词缀分外三小类：前缀，后缀和中缀。