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Critical angle of refraction - semi-circular cylindrical mobile light source, the incident angle change the size of refraction angle to change at this time, when the refraction angle = 90 degrees, which is critical at this time angle of incidence angle, the critical angle of water at 40 degrees large about anything mobile source of water in the water screen that is a reflection of light, a phenomenon that total reflection.

光折射的临界角定义：光折射角=90度时，入射角即为临界角，按二方法，将半导体激光光源去掉铁夹，吸附在右下角的铁板上入射光对准中心，即产生折射光线，沿半圆形柱面移动光源，改变入射角的大小，这时折射角也改变，当折射角=90度时，这时入射角即为临界角，水的临界角大的在40度左右，再做移动光源在水中的水屏即出现反射光线，这种现象称全反射。

NCPC currently produces antibiotics, semi-synthetic antibiotics, biologics, pesticides and animal products, starch, glucose and vitamins both in bulk and finished products.

华北制药产品覆盖抗生素、半合抗药品、生物、农药、兽药、淀粉、维生素等范围。

In this paper, we discuss the problem of using semi-supervised learning method to do video semantic annotation.

本文讨论了利用半监督学习方法进行视频语义标注的问题。

The invention relates to an ESD protector which comprises the first well and the second well inside the semi-conductor liner, while a separating area is between them; the N pour area is inside the second well, to couple the first node; the NLDD area is between the N pour areas, and annularly poured under the NLDD areas; when the voltage of first node is higher than the breakdown voltage, the current discharge path is limited by the NLDD area and annular pour; said breakdown voltage is lower than the breakdown voltage of oxide of logic gate.

本发明提供了ESD保护技术。一种ESD保护器件包括设置在半导体衬底中的第一阱区和第二阱区，并且隔离区位于中间。N 注入区被设置在第二阱区中，并且在第一节点处耦合在一起。NLDD区被设置在N 注入区之间，并且环形注入位于每个NLDD区之下。当第一节点的电压超过击穿电压时，电流放电路径由对应的NLDD区和环形注入所限定。在一个具体实施例中，所述击穿电压小于逻辑门氧化物的击穿电压。

The product is particularly well suited to the development of agriculture and animal husbandry, reforestation, gardening and landscaping, flora-cultivation, anti-desertification in arid and semi-arid areas.

该产品尤其适用于干旱及半干旱地区的农牧业生产、植树造林、园林绿化、花卉种植及土地荒漠化治理。

Under direction of historical materialism, Chen Du-xiu analyzed the social property according to the invading from the western countries and the variety of the China, and coming to conclusion that the mode of production in China have been changed, China becoming"semi-colony"on the politics, then Chen putting forward the democracy revolution is a modern history topic of the Chinese society, anti-imperialism and anti-feudalism is the basic mission of the democracy revolution.

陈独秀以唯物史观为指导，从西方列强入侵中国和中国社会自身的变化来分析近代中国的社会性质，认为近代中国的生产方式发生变动，政治上成为"半殖民地"，进而提出民主革命是近代中国社会的历史主题，反帝反封建是民主革命的基本任务。

A semi-empirical model of a parasite system power of a fuel cell engine is developed by modifying the antitrigonometric function,and is verified by different test data.

分析了燃料电池发动机辅助系统功率的变化特点及其规律，并在试验研究的基础上，通过反三角函数进行改造，建立了辅助系统功率特性的半经验模型。

Antu county situated in the center of Changbai mountains, has a temperate of semi-moisture continental monsoon climate .the character of climate is frost-free period 121 days

安图县地处长白山腹地，属中温带湿润气候区的温凉区和冷凉区，其主要气候特点是：生长期短，气候冷凉，雨量充沛，日照较足。无霜期121天

Methods Turning tests induced by apomorphine and forelimb functional tests were performed. Also, the expression of TH mRNA in mesencephalon of the rats was detected by semi-quantitative analysis of one step RT-PCR.

利用阿朴吗啡诱发旋转试验和前肢功能试验，检测PD大鼠的神经行为学特点，一管法逆转录聚合酶链反应半定量检测其中脑TH mRNA的表达。

The primary phases of Al-10% Cu, Al-20% Cu Al-40% Cu alloy are nearly equiaxed spherical or rose spherical by semi-solid processing. Compared with the coarse arborization of Al-10% Cu, Al-20% Cu Al-40% Cu alloy of conventional casting, the structure of alloy is extremely improved and the appropriate grain size for the engineering application is obtained.

结果表明：利用半固态加工，可以使Al-10%Cu、Al-20%Cu、Al-40% Cu合金的初生相呈近等轴的球状或蔷薇球状，与普通铸造Al-10% Cu、Al-20% Cu、Al-40%Cu合金较粗大的树枝状相比，合金的组织得到显著的改善，达到了工程应用晶粒大小。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐