等边三角形

The second part is the computational methods of the determinant: This part is core part in the full text, and mainly studied 14 kinds computational methods which nearly covered each kind of the characteristic of the determinant computation, including the definition method, the triangle method, Canada method and so on.

第二部分为行列式的计算方法：这一部分是全文的核心部分，主要研究了几乎覆盖各种特征的行列式计算的十四种重要方法，包括定义法、三角形法、加边法等，它们为我们计算行列式提供了方便快捷的途径。

Tringle Quadrilateral hexagon octagon and cireular flat shape can be formed. Cambered net shell can have the form of cylinder, olive, ball, etc.

可构成三角形、四边形、六边形、八边形和园形等多种平面形状；曲面网壳则可以构成园筒形，橄榄形、园球形等任意形状。

Specifications for the scope of é 1.5 ~é 85mm round light, S5 ~ S75mm hexagonal-to-edge, 4 * 4 ~ 60 * 60mm square steel, ordered the file flat, triangular, semi-circular, such as special types of steel.

可供规格范围￠1.5～￠85mm光圆、S5～S75mm对边六角、4*4～60*60mm方钢、订制各档扁形、三角形、半圆形等特种类型钢。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。