查询词典 latus rectum

This article takes the teaching of conic sections as an example. By designing worksheets, teachers can introduce the historical material about conic sections to students. By way of using Apollonius' definition of parabola, ellipse and hyperbola, teachers can introduce the geometric aspect of "conic section" to students. By using the concept of " latus rectum " in Conics , we can connect "conic sections"-- representation of geometrical aspect, with "the equation of conic sections"-- representation of algebraic aspect to improving insufficiency of text books.

同时本文也试著从历史文本中寻找材料，简单举例说明数学教师可以如何应用这些史料在几何单元教学上，例如三角函数的正余弦定理，最后再以圆锥曲线的正焦弦为例，说明如何利用数学史料於此单元的教学，尤其是阿波罗尼斯的《锥线论》中对圆锥曲线的3个命题，将此3个命题的内容与意涵，尤其是正焦弦在圆锥曲线的几何意义上所扮演的角色，将其适当地融入教学中，将可使学生真正学习圆锥曲线的几何知识，而不再只是代数形式的几何知识。

Keywords : the unity of geometrical material and algebraic symbol, conic sections, latus rectum .

教师藉由数学史的帮助，除了使学生的一些认知障碍获得解决之外，也可促进自己本身的专业成长。

Type YZF duck-billed valve, also be called "rubber flexible check-valve", it has function similar to tide gate, flapper gate but its working principle and structure is different, its mounting pattern is generally classed to pipe hoop form and flange form( flange form is generally used in case that latus rectum is larger than DN800, otherwise pipe hoop form is used).

YZF 型鸭嘴阀，又称"橡胶柔性止回阀"，与潮门，拍门功用相似，但工作原理和结构不同，其安装形式一般分为管箍式和法兰式（法兰式一般大于通径 DN800，管箍式一般小于通径 DN800），本体材质为橡胶，可广泛用于排水管出口，防止水流倒灌，造成事故。

The company product mainly uses Chinese GB, API API, American ANSI, British BS, German DIN, Japanese JIS, standards and so on French NF, production latus rectum DN15-DN2000mm (1/2 "- 80 "), the pressure stage 0.25-6.4Mpa(125LB-600LB), the material mainly has HT200, HT250, HT300, QT400, QT450, WCA, WCB, and so on, the year productivity 80000 tons, the product widely applies in the petroleum, the chemical industry, the electric power, the construction, the medicine, gives draining water and so on each domain.

公司产品主要采用中国GB，美国石油学会API、美国ANSI，英国BS，德国DIN，日本JIS，法国NF等标准，生产通径DN15-DN2000mm(1/2"—80")，压力级0.25-6.4Mpa(125LB-600LB)，材料主要有HT200、HT250、HT300、QT400、QT450、WCA、WCB、等，年生产能力80000余吨，产品广泛应用于石油、化工、电力、建设、医药、给排水等各项领域。

The company product mainly uses Chinese GB, API API, American ANSI, British BS, German DIN, Japanese JIS, standardsso on French NF, production latus rectum DN15-DN2000mm (1/2 "- 80 "), the pressure stage 0.25-6.4Mpa(125LB-600LB), the material mainly has HT200, HT250, HT300, QT400, QT450, WCA, WCB,so on, the year productivity 80000 tons, the product widely applies in the petroleum, the chemical industry, the electric power, the construction, the medicine, gives draining waterso on each domain.

公司产品主要采用中国GB，美国石油学会API、美国ANSI，英国BS，德国DIN，日本JIS，法国NF等标准，生产通径DN15-DN2000mm(1/2"—80")，压力级0.25-6.4Mpa(125LB-600LB)，材料主要有HT200、HT250、HT300、QT400、QT450、WCA、WCB、等，年生产能力80000余吨，产品广泛应用于石油、化工、电力、建设、医药、给排水等各项领域。

Type YZF duck-billed valve, also be called "rubber flexible check-valve", it has function similar to tide gate, flapper gate but its working principle and structure is different, its mounting pattern is generally classed to pipe hoop form and flange form( flange form is generally used in case that latus rectum is larger than DN800, otherwise pipe hoop form is used).

YZF 型鸭嘴阀，又称&橡胶柔性止回阀&，与潮门，拍门功用相似，但工作原理和结构不同，其安装形式一般分为管箍式和法兰式（法兰式一般大于通径 DN800，管箍式一般小于通径 DN800），本体材质为橡胶，可广泛用于排水管出口，防止水流倒灌，造成事故。

The company product mainly uses Chinese GB, API API, American ANSI, British BS, German DIN, Japanese JIS, standards and so on French NF, production latus rectum DN15-DN2000mm (1/2 "- 80 "), the pressure stage 0.25-6.4Mpa(125LB-600LB), the material mainly has HT200, HT250, HT300, QT400, QT450, WCA, WCB, and so on, the year productivity 80000 tons, the product widely applies in the petroleum, the chemical industry, the electric power, the construction, the medicine, gives draining water and so on each domain.

公司产品主要采用中国GB，美国石油学会API、美国ANSI，英国BS，德国DIN，日本JIS，法国NF等标准，生产通径DN15-DN2000mm(1/2&—80&)，压力级0.25-6.4Mpa(125LB-600LB)，材料主要有HT200、HT250、HT300、QT400、QT450、WCA、WCB、等，年生产能力80000余吨，产品广泛应用于石油、化工、电力、建设、医药、给排水等各项领域。

The company product mainly uses Chinese GB, API API, American ANSI, British BS, German DIN, Japanese JIS, standardsso on French NF, production latus rectum DN15-DN2000mm (1/2 "- 80 "), the pressure stage 0.25-6.4Mpa(125LB-600LB), the material mainly has HT200, HT250, HT300, QT400, QT450, WCA, WCB,so on, the year productivity 80000 tons, the product widely applies in the petroleum, the chemical industry, the electric power, the construction, the medicine, gives draining waterso on each domain.

公司产品主要采用中国GB，美国石油学会API、美国ANSI，英国BS，德国DIN，日本JIS，法国NF等标准，生产通径DN15-DN2000mm(1/2&—80&)，压力级0.25-6.4Mpa(125LB-600LB)，材料主要有HT200、HT250、HT300、QT400、QT450、WCA、WCB、等，年生产能力80000余吨，产品广泛应用于石油、化工、电力、建设、医药、给排水等各项领域。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。