防护

It is suitable to calculate the quantities of subgrade protection and drainage project, especially in the draft design and predesign phase of the highway or railway.

该方法尤其适用于公路或铁路的方案研究阶段及初步设计阶段的路基防护及排水工程数量的统计。

Prestretch the strap before placing respirator on the face.

在脸上戴呼吸防护口罩之前，先拉伸头带。

The ground 2 meters of above, working cant gradient is more than 45 °, working area did not establish crural place smoothly or have quaky place, should regard headroom as exercise. 3, the person that altitude works must use safe protective equipment (like safety helmet, safety belt, the) such as soft sole.

高血压、腿脚不灵、头昏者，均不得登高。2、地面二米以上，工作斜面坡度大于45°，工作地面没有平稳的立脚地方或有震动的地方，应视为高空作业。3、高处作业者必须使用安全防护用品(如安全帽，安全带，软底鞋等)。

The safety of radioactive sources is a primary issue of radiological protection in China.

放射源的安全已成为我国当前辐射防护的一个主要问题。

Thus three kinds of electrochemical methods were introduced for the measurement of the rebar corrosion.

混凝土中钢筋锈蚀机理及防护研究中电化学测量有其重要的现实意义。1混凝土中钢

From radiative protection side, my methods of malignant disease diagnosis and dangerous degree analysis are gave out through standards, regulations and laws which are carried out in the world and successful experiences from radiative material management in foreign countries and current situation of material application and management, which will help us have a scientific radiative material management evaluation system. Through cased study and comparison analysis, in organization reformation, I point out:1. Separate 'supervising right' with 'checking right', it will keep lawexecuting open and fair.2. Main body function reforger after reformation, all levels sanitarian organizations are judges, give judge a new right, all radiative application units are athletes, all activity should be under regulations.

结合国内国际正在实行的标准、法律法规和相关的规章制度，借鉴国外在辐射管理方面的成功经验，结合我省放射性物质应用和监督管理的实际情况，在辐射防护评价方面，我提出恶性疾病个体鉴定的方法和危险度分析方法，使得我们的辐射监督管理有了一套科学的评价系统；采用案例研究和比较分析的方法，从机构改革方面我提出：(1)需要将&监督权&和&检测权&分离，这样才能保证执法管理机构公开公正；(2)改革后的各个主体需要进行职能再造，即各级卫生监督管理机构是裁判员，重新赋予其裁判员的相关职权；各个放射性物质应用单位是运动员，在游戏规则内从事活动；各个放射卫生检测机构作为中介机构，接受管理机构的委托为&运动员&提供有偿服务。

Like Our Lady of Hope, it was strong on the religious themes; a cross jutted regally from the roof of the institution, and even the tops of the bars of the fence were fashioned to resemble crosses.

和 Our Lady of Hope 一样，它强调宗教的主题，一个十字架从机构的屋顶帝王般伸出，并且连防护栅栏顶端的横木都是类似十字架的形状。

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。

Repellency is not confined to the olfactory senses.

防护性不只限于嗅觉感官。

In a word, the greening of residential area should take advantage of the plants' purify, beautification and protective function, making people's daily life every detail and greening in close contact with each other,let residental area is no longer drab, but a complete green ecological system, various kinds of color is the plant, flowering plants, shade plants to create landscape, it is pleasant to create a harmonious natural inhabitants of ecological living space.

总之，居住区绿化要充分发挥植物的净化、美化及防护功能，使人们日常生活中每一细节与绿化密切接触，让居住区绿化不再是一两块单调的绿地，而是一个完整的绿地生态系统，是用各类色叶植物、开花植物、遮阴植物等营造出的怡人景观，是为居民创造的一个和谐自然的生态居住空间。

Do not gum up the work by telling mother what we are going to do .

别告诉母亲我们要干的事，那会把事情搞糟的。

In recent years, application of the partial prestressed concrete beam s is developed.

近年来，随着部分预应力砼梁应用的推广，发现我国规范所采用的名义拉应力法的计算结果不稳定。