低等的

In the existing process of PVB, it has disadvantages of unsteady aldehyde groupdistribution, low content of aldehyde acetal group .

本文针对聚乙烯醇缩丁醛传统生产工艺生产的PVB存在缩醛基分布不均，缩醛度低等缺陷，系统地研究了分阶段醇解一缩合的均相工艺，二甲基亚砜的均相工艺以及极性匹配的醇法均相工艺。

According to the existent problem of the running water film deduster which included the more pressure drop and the efficiency of low removal dust,the method was discussed by applying venturi and rotating-stream-tray and spraying and demister to reconstruct the old deduster.

针对文丘里水膜除尘器运行中存在的压降过大和除尘效率过低等问题，采用文丘里+旋流板+喷淋+折流除雾器的方法对原有除尘器进行改造。改造工程应用表明，该方案的阻力和除尘效率在理论上的分析与实际应用相一致，在文丘里喉管气速 40m/s，液气比 0 。5L/m3 ，喷淋液气比为 1.5L/m3 时，除尘效率达到 95 %以

The low isotactic polypropylene grafted by MAH in the presence of St as comonomer was prepared by solution reaction.

低等规聚丙烯是由等规立构和间规立构组成的嵌段共聚物，具有低的结晶性能、良好的粘接性和加工性能，在胶粘剂领域有着广阔的应用前景。

The low isotactic polypropylene grafted by MAH in the presence of St as com-onomer was prepared by solution reaction.

低等规聚丙烯是由等规立构和间规立构组成的嵌段共聚物，具有低的结晶性能、良好的粘接性和加工性能，在胶粘剂领域有着广阔的应用前景。

It offers scientists a specialized, interdisciplinary forum for prompt dissemination of information on all aspects of pigment cell biology of plants, fungi, invertebrates, lower vertebrates, and higher vertebrates, including man.

它为科学家在快速的传播植物，真菌，无脊椎动物，低等脊椎动物，高等脊椎动物包括人在内的色素细胞生物学方面提供了专业的、边缘学科信息方面的交流论坛。

In this paper, the authors found the pyritized rod-like bacteria in desmocollinite and the Cyanophytes's gelationous sheath and the degraded organic matter of blue green algae in collinite of high-sulfur coal seams No.9 w(So=2.67% and No.10 w(So=2.54% using SEM-EDX and TEM. These findings of bacteria and algae suggest that they play an important role in the high-sulfur formation.

应用带能谱仪的扫描电镜和透射电镜，在乌达矿区高硫煤9煤层和10煤层的基质镜质体中发现了黄铁矿化的杆状菌落，在无结构镜质体中发现了蓝藻胶鞘及其降解有机质，这些菌藻类体的发现表明低等生源在高硫煤形成过程中起了重要作用。

In this paper,the problems of the large traveling grate stocker hot water boilers applied at the present time are investigated and analyzed,and the main designing principles for the large traveling grate stocker hot water boilers are proposed,according to the characteristics of the central heating system operation.

1引言由于采用热水供热系统具有采暖质量好、节能、运行安全、设备维护费用低等优点，热水供热系统目前已经成为我国北方城镇集中供热的主体形式，同时也推动着热水锅炉技术的发展和进步，使其朝着大型化和多型化方向发展〔1，2〕。由于我国环境保护标准的限制并考虑到燃烧设备的运行可靠性，目前，我国绝大多数集中供热用热水锅炉是大型链条炉排热水锅炉。

Problems entailed by the dense phase pulverized coal system, including the system s conveying stability,pulverized coal burnout and furnace slagging are elucidated and corresponding countermeasures sugges.

分析了该技术所特有的输粉系统简化、燃烧稳定、污染物NOx排放低等特性，阐述了高浓度煤粉系统所带来的输送稳定性、煤粉燃尽和炉膛结渣等问题，并提出了相应的解决方案，比较了常规煤粉系统与高浓度煤粉系统的经济性。

In lower vertebrates, the pineal gland has an eye like structure and it functions as a light receptor and is considered by some to be the evolutionary forerunner of the modern eye.

在较低等脊椎动物里，松果体有一个类似眼睛的结构而它的功能如同光的受体，一些人认为是现代眼睛进化早期的样子。

This model is proposed in the background of the Internet's mass, changeable resources.On the one hand, its semantic inference solves the problems, such as the low recall, which appears in the search; on the other hand, it makes good use of ontology resources to do query excitation that provides more userfriendly search and advances the efficiency of the ontological inference.

以Internet上海量、多变的资源为背景，一方面通过语义推理，优化了网络搜索中存在的如查准率低等问题，另一方面利用本体库资源，在网络搜索过程中做问题激发，不仅增强了搜索的人性化，更提高了语义分析的效率。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。