查询词典 shortages

This paper will analyze shortages of traditional test of mathematics pedagogy course,point out the imminency of the test innovation,explore the advantage of situated tests fited with the innovation of mathematics course of the foundational education,the modes found situation,the designing of question type.

分析数学教学论课程传统考试的弊端，提出考试改革的迫切性，探讨与基础教育数学课程改革相适应的情境化考试的优势及情境创设方式和考试题型设计

This has been the most recent of ongoing opposition to Coca-Cola's inethical conduct in India, where they have been alleged to have caused severe water shortages, water and land pollution, the distribution of toxic waste as fertilizer, and for the sale drinks containing high levels of pesticides.

这是印度持续不断反对可口可乐公司不道德行为最近一次的抗争，他们表示可口可乐在当地设厂已经造成当地严重的用水短缺，以及水源和土地的污染问题，并且把有毒的工业废料当作肥料丢弃，同时其出售的饮料含有高浓度的杀虫剂。

The history and current development of airborne Lidar system is expounded, the problems and shortages are pointed out, and the works and achievements interiorly are introduced in detail.

阐述了机载激光雷达系统的发展历史和当前的发展动态，指出了存在的问题和不足，详细介绍了我国在这方面所做的工作和已有的成果。

Its main purpose is under the grim situation of serious water shortages and pollution to introject the scientific use of water resources with the prosperous development of integrated real estate , to let reused water technology serve for the green real estate , and make water science and water culture to popularize to millions of people .

旨在通过在水资源严重短缺和污染的严峻形势下，把水资源的科学利用与蓬勃发展的房地产业相融合，使中水回用为绿色环保的房地产业服务，使水科学，水文化普及到千家万户。

Synthesis of methyl formate by carbonylation of methanol with only sodium methoxide as catalyst exists some shortages, such as low activity, rapid loss of activity and short catalyst life.

以单一甲醇钠作为催化剂通过甲醇羰基合成甲酸甲酯，存在催化剂活性不高、易失活、寿命短等问题。

And hard currency shortages, and for competitive bidding on major nonmilitary government procurements.

它的出现为金融资产项目和商品共享企业提供了一种工具，确保了投资者对被外债和严重货币短缺困扰的国家的投资利益的回收，并为政府竞标主要的非军事采购。

The traditional transformer online monitoring system generally adopts oxygen carrier gas, chromatographic column. And the equipment is not simple with many shortages such as periodic calibration of chromatography column and sensor, low reliability of equipments and overelaborate detection procedure of gas composition.

由于变压器传统的在线监测系统一般采用色谱柱，需要消耗氧气和载气，而且色谱柱和传感器需定期标定，装置可靠性不高，检测气体成分过程繁琐，因此第6章根据比尔-朗伯特(Beer-Lambert)定律，按照光纤气体差分吸收的原理，设计了一套基于光纤气体传感器的变压器在线监测系统。

Environmental problems, shortages of energy and water and demographic imbalances are other Chinese weaknesses that have long been pored over.

环境问题、能源短缺、水资源和人口分布不均是一直以来是制约中国经济发展的其他因素。

Environmental problems, shortages of energy and water and demographic imbalances are other Chinese weaknesses that have long been pored over.

环境问题、能源与水资源短缺以及人口结构性失衡问题，也是中国长期以来一直备受关注的缺陷。

But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.

本文针对真空开关投切电容器组时因重燃而产生的过电压及其防治措施进行了研究，所开展的主要工作和研究结果如下： 1、对过电压的产生机理及其影响因素进行了分析，指出单相重燃是导致开关设备损坏的主要原因，而两相重燃则是导致电容器组损坏的主要原因，因此单相重燃和两相重燃过电压是防护的重点； 2、对电容器组操作开关的特殊运行条件进行了分析，指出在这种运行条件真空开关难于实现不重燃，因此采用保护装置更具有现实意义； 3、对RC与MOA的保护效果和存在的不足进行了分析，指出这两种方法均只能有效抑制单相重燃过电压，而不能在发生两相重燃时保护电容器组； 4、重点对G-R阻尼装置的工作原理进行了分析和讨论，指出该装置接入后线路中将会出现两种频率的高频振荡，而电容器组上的过电压是由这两种振荡共同决定的； 5、根据对上述两种振荡的分析指出存在一个最佳电阻值使得过电压最低，并提出了电容器组电压和最佳电阻值的近似求解方法； 6、使用电气暂态分析软件MATLAB对G-R装置的保护效果进行了仿真计算，证实该装置确实可以有效抑制重燃时的电容器组过电压； 7、根据仿真与近似计算结果的偏差提出了近似计算的修正方法，经过修正后的过电压计算结果与仿真结果吻合较好； 8、对G-R装置中放电装置G与阻尼电阻R的要求进行了分析，指出采用编织电阻和真空间隙可能是最佳选择。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。