查询词典 contamination

The researches from many countries and zones indicate that none point-contamination is the principal causation witch induces water quality deteriorated.

许多国家和地区研究证实，面源污染是导致水环境恶化的主要原因。

Contamination total quantity control has been one of the most important measures to prevention and cure the water pollution in China.

中文摘要：污染物总量控制已成为我国水污染防治的一项重要举措，是实行水资源保护目标管理的重要依据，也是开展水资源保护规划的基础。

According to the areas, circumferences and dimensions of the particles, classifies oil contamination level by means of statistics principle.

采用数理统计的原理，根据面积、周长和粒径对油液污染度进行分类统计和描述，对油液污染度进行分级。7。

This paper attempts to associate PFC technology with Quasi-Resonant DC/DC Converter and Synchronous Rectifier technology, to work out a novel switching power supply with higher efficiency and low contamination, which both achieved high power factor, improved effecting on electrical network and ensured high efficiency, furthermore, it is easy to be realized and controlled in circuit.

本文首先阐述了开关电源、功率因数校正技术和同步整流技术的发展及现状，对DC/DC变换的拓扑结构进行了选择，确定了带有隔离的准谐振(Quasi-Resonant)反激型电路，可以有效地降低损耗；接着本文对几种常见的PFC拓扑电路进行分析对比，从中选择了BOOST型电路，对工作在临界状况下的电路进行了分析，采用跟随输入电压的升压变换新技术，减小了电感体积，同时降低了开关管的电压应力，既简单又有效地实现了功率因数校正，并发现此技术值得推广；由于反激型变换器的效率一般都较低，所以本文在传统同步整流技术基础上对其加以改进，设计出一种新颖、高效的同步整流方案。

After 1200 hours test,the cooler presents certain degradations which is caused by contamination of regenerator.

样机工作参数的走势显示，退化呈现由污染所致的典型特征，初步验证了高温工作加速污染退化的可行性。

By the late-twentieth century,'literature', as a concept and as a term, has become so problematical—either through ideological contamination as the high cultural 'Canon', or, conversely, through demystification and deconstruction by radical critical theory—that it approaches the unuseable, at least without contorted apologetics.

至于前面那段不知所云的中文，在20世纪后期，&文学&作为一个概念、一个术语，已然大成问题了。一方面是由于意识形态的污染把它视为高档文化之典范；要么相反，通过激进批评理论的去神秘化和解构，使之成为不适用的，至少是没有拐弯抹角的辩护。

Environmental sedimentology, studying environment and disaster, must be important for solution of environment contamination, ecological destroy, geologic disaster and global climate change, and are becoming one of important development directions of sedimentology.

环境沈积学以环境和灾害研究为己任，将在解决人类面临的环境污染、生态破坏、地质灾害、全球气候变化等重大问题的研究中发挥越来越重要的作用，是未来沈积学发展的重要方向之一。

Alcohol-based skin disinfectants could be used if there is no obvious organic material contamination.

含酒精的皮肤消毒剂可以在无明显有机物质污染时使用。

Using the same element in both electrolytes avoids contamination problems.

相同元素的使用避免了污染的问题。

Summing up these results, we think that the Yinmawanshan batholith came from the mixing, the fractional crystallization and the crust contamination of the enriched lithospheric mantle and the low crust magma.3、the time relationship between the Yinmawanshan batholith' formation and the tectonic extension The field observation and petrology have clearly showed that the Yinmawanshan batholith intruded in the forming period of the Liaonan metamorphic core complex, so this provided direct geological evidence to the viewpoint that the early Cretaceous magamatism of the eastern China developed in the extensionally tectonic setting.

还有一个证据来自对A型花岗岩的研究。A型花岗岩的年代学研究结果显示在东北的大兴安岭地区、张广才岭地区、本文研究区的辽东半岛，几乎所有的上述A型花岗岩都是在120-130 Ma期间形成的，与本文研究的饮马湾山I型花岗岩同时。地球化学资料还显示，这些花岗岩基本具有A1型非造山花岗岩的特点，充分反映了我国东部早白垩世的地质演化与伸展体制有关。根据上述资料我们推测，辽东半岛南部饮马湾山岩体形成时的我国东部由于受岩石圈减薄作用影响而使全区处于伸展构造体制。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷