使不变

If chopping down forests for fuel doesn't sound like the greenest solution to our energy needs, the scientists note that we'd have to figure out how to manage our woodsheds sustainably , to avoid slashing and burning our way to a toasty home and a bare Earth. But trees are renewable.

如果砍伐森林来获取燃料，听起来不是能源需求最绿色的解决方案，科学家们指出，我们必须弄清楚如何管理我们可持续的木头燃料，以避免乱砍乱伐的方式来给我们的房子供暖，使地球变得荒芜。

Butt Weld and docking and corner combinations Weld, in Weld ends located arc plate and extraction plate in igniting board then leads to the welding seam, joint halfway shall weld joints in front of 2.0 mm Department Firing arc, welding pieces after preheating rod will return to weld the origin, pool filled to the required thickness, before forward welding; Welding speed : Isokinetic welding requirements to ensure weld thickness, width uniform, which masks to look for hot metal and slag bath equidistance (2-3 mm)%; Arc welding rod length : different models and determined that the general requirements of arc length is stable, acid electrode generally 3-4 mm, 2-3 mm normally alkaline electrode%; Welding perspective : According to determine the thickness of two pieces of welding, welding angle has two aspects : First, the angle between the direction of the rod and welding of 60-75 ; The second is the angle between two electrodes and welding around, the same thickness as welding, welding and welding pieces incident angle of 45 ; When the thickness ranging from welding, welding electrode and thick and thin pieces of welding electrode side angle greater than the angle between the side pieces; Arc : admission to the end of each weld should be filled crater, in the direction opposite to the direction of the back-arc welding, arc welding unchanged inside pit in 1974, to prevent the crater bite of meat.

对接焊缝及对接和角接组合焊缝，在焊缝两端设引弧板和引出板，必须在引弧板上引出后再焊到焊缝区，中途接头则应在焊缝接头前方15～20㎜处打火引弧，将焊件预热后再将焊条退回到焊缝起始处，把熔池填满到要求的厚度后，方可向前施焊；焊接速度：要求等速焊接，保证焊缝厚度、宽度均匀一致，从面罩内看熔池中铁水与熔渣保持等距离（2～3㎜）为宜；焊接电弧长度：根据焊条型号不同而确定，一般要求电弧长度稳定不变，酸性焊条一般为3～4㎜，碱性焊条一般为2～3㎜为宜；焊接角度：根据两焊件的厚度确定，焊接角度有两个方面，一是焊条与焊接前进方向的夹角为60～75 ；二是焊条与焊接左右夹角有两种情况，当焊件厚度相等时，焊件与焊件夹角为45 ；当焊件厚度不等时，焊条与较厚焊件一侧夹角应大于焊条与薄焊件一侧夹角；收弧：每条焊缝焊到末尾，应将弧坑填满后，往焊接方向相反的方向带弧，使弧坑甩在焊道貌岸然里边，以防弧坑咬肉。

To our mind a more mature dialogue with the world, in the examination is not our final battle, in front of us there will be more high mountains, the only way to defeat it is to make itself more powerful.

我们要以更成熟的头脑与世界对话，中考不是我们最后的战役，我们的面前会有更多的崇山峻岭，战胜它的唯一办法就是使自己变得更加强大。

modulation is the transmission of information to be loaded onto a high-frequency signal in the process.amplitude modulation using signal to control the rate of carrier,with its linear modulation signal changes,and maintain the same carrier frequency.in the amplitude modulation,in accordance with the strength of signals in the spectrum of different components,it is divided into ordinary am (amplitude modulation standard am),with inhibition of bilateral carrier am,the carrier single sideband suppression am.the main difference is the different methods and structure of the spectrum.

摘 要：调制是将要传送的信息装载到某一高频信号上去的过程。振幅调制是用调制信号去控制载波的幅度，使其随调制信号线性变化，而保持载波的频率不变。在幅度调制中，根据已调信号的频谱分量不同，分为普通调幅、抑制载波的双边带调幅、抑制载波的单边带调幅。它们的主要区别是产生的方法和频谱结构不同。

The results showed that the sandy soil in layered soil profile can stimulate or obstacle the water movement as compared to the uniform loam column with 50cm depth of water table, this was mainly determined by the position of the sand layer.

结果表明，砂层对于水分的蒸发既有促进也有抑制作用，在地下水埋深为50 cm时，5 cm厚的底砂层可使水分的蒸发强度增加10%～20%；砂层距水位的距离大于5 cm时，砂层可抑制水分的蒸发，且当距离增加到35 cm左右，其抑制率可达70%～80%；当砂层距水位的距离继续增大时，水分的蒸发强度基本保持不变。

In this paper an innovative method for machining sculptured surfaces is presented. By using a disc cutter with a concave end instead of traditional ball-ended or drum-shaped tools, and adjusting the cut- ted axis to swing relative to the component being machined under some special rules, the envelope formed by the trace of the tool-nose may have the same derivative up to the third order as the required theoretical surface.

本文提出了一种加工自由曲面的新方法，即采用中凹的盘形铣刀取代传统的球头或鼓形铣刀，在每一行程中让刀具轴线相对于工件按特定的规律摆动，使得在垂直于进给方向的法截面中，由刀尖轨迹形成的包络面与理论曲面的法截线具有相同的1～3阶导数，从而在保持精度不变的前提下，使实际行程次数得以大幅度的减少。

Otherwise, the control flow estimate makes no difference among processes which are congruent under α conversion by labeling restricted names and variables with stable names in the syntax of Mobile Safe Ambients.

在Mobile Safe Ambients演算进程的拓扑结构抽象表示基础上，通过识别可被激活的移动原语和通讯原语，计算系统运行的所有动态进程拓扑结构，并在文法规则中显示地标识约束名字和变量，使分析结果在α变换下保持不变。

We include the electromagnetic effects consistently in the QCD sum rule approach to keep the final sum rule gauge invariant. Then we study the role of electromagnetic effects in the isospin symmetry breakings of the system.

我们把电磁相互作用自洽地包括进来使最后的求和规则是规范不变的，然后研究电磁效应在体系的同位旋对称性破缺中的作用。

Set beer as an example, the mixing turbidity could be as low as below 0.5EBC. A kind of special filter part- filter candle sticks, which are a certain number of hollow metal sticks with special structure and constant space in between each other, is one of the best filter parts till now for its high efficiency and conveniency of cleaning. It is ideal diatomite filter equipment for its small operation space, high efficiency and low running cost.

经过滤的液体能有效除去液体介质中的颗粒物质、酵母菌和其他微生物，使过滤后的介质清澈，光亮（以啤酒为例，混合浊度可达0.5EBC以下）该机采用结构特殊的过滤元件---过滤烛棒，是若干根结构特殊间隙恒定不变的空心金属棒体，过滤效率高，易清洗，是到目前为止最优秀的过滤元件之一，该机占地面积小，生产效率高，运行费用低，是最理想的硅藻土过滤设备。

As the company's main product - both rotary joint From design to production have continued to innovation, many models adopted a new balance of mechanical seals designed to seal the end than the pressure to maintain the minimum and unchanged, optimization of the friction material composition and the use of advanced NC Processing Center, sealing performance, life has a great degree of improved technology and products so that the water quality in the average domestic leading position.

作为本公司的主导产品--旋转接头无论从设计到制作都不断努力创新，许多型号采用了新的平衡机械密封设计，对密封端面产生的比压值保持最底限度且不变；优化了摩擦副材料的组合，并采用先进的数控中心加工，密封性能，使用寿命都有了很大程度的提高，使产品的技术和质量水平均处于国内领先地位。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。