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The power line transmission model has been established to explain the direct sequence spread spectrum is the the best method to modulate the signal to overcome the power line's shortcomings of high reduction, high noise, high distortion, and so on and make it possible to be a workable correspondence medium.

论文建立了低压电力线的传输模型，在此基础上提出采用直接序列扩频载波通信来克服电力线作为传输介质具有的高削减、高噪声、高变形等缺点，使电力线成为一种可靠的通信媒介。

During the past two decades, EO polymers based on high performance polymers with high glass transition temperatures have been one of the most active research fields due to their high thermal stability of the dipole moment after poling and long lifetime that are the two key problems in their applications.

在二十多年的发展历程中，以具有高的玻璃化转变温度的所谓"高性能聚合物"为母体的电光高分子材料由于具有较高的取向稳定性和较长的使用寿命，一直是研究的热点和重点之一。

Money market fund is a kind of investment funds with high security, high mobility and high stability.

货币市场基金是一种具有高安全性、高流动性和高稳定性的投资基金品种。

Lines of"CP"and"HoCP"are early varieties, and they showed high sucrose content and high resistance to smut disease, mosaic disease and drought, and can be used as parents for crossing with varieties of high yield and large stem to breed new varieties.

本研究中的"CP"、"HoCP"系列品种早熟、高糖，且黑穗病、花叶病的抗性强，耐旱性较强，可尝试用作亲本与我国的高产大茎品种杂交选育新品种。

With the rapid development of modern science and technology, high speed, high precision and high efficiency have become the most important trend of current moulding machine.

随着现代科技的高速发展，高速度、高精度、高效率已经成为现代模切机械最重要的发展趋势。

The Mn alloying has less effect on environmental embrittlement. The alloy with Mn has higher ambient strength, elevated-temperature strength and larger ductility because of high cleavage strength, high movability of dislocation and high ordertype transformation temperature.

Mn的合金化对合金的环境氢脆作用影响不大，但是加Mn后的合金解理强度得到提高，位错的易动性增强，有序类型转变温度提高，故合金在宏观上表现为室温、高温强度提高、塑性增大，因此Mn的低合金化是改善Fe〓Al基有序合金力学性能的一个重要方法。

The cyclones with short cone are used for crude grading of minerals with heavier specific gravity in gold mines, sand gold mir.es and sulphur ore mines and have such advantages as small ground occupation, high capacity, high operating flexibility, low energy consumption and high movability etc.

短锥分选旋流器用于金矿、砂金矿、硫化矿等比重较大的矿物的粗选作业，具有占地面积小，处理能力大，操作弹性大，能耗低，可移动性强等优点。

In order to satisfy the future requirements of fixed broadband wireless Access systems for high data-rate and high frequency efficiency, technical renovation on the physical layer and control layer is demanded. The paper analyzes relevant technologies sUCh as the high spectrum utilization antenna, robust time-delay extension modulation, equalization and encoding, highly efficient multi-address access and adaptive linking.

为了满足未来固定宽带无线接入系统高数据速率传输及高频谱利用率的要求，就需要在物理层和媒体访问控制层进行技术上的革新，所涉及的关键技术包括：高频谱利用率的天线系统、具有时延扩展鲁棒性的调制方式、均衡与编码技术、高效的多址接入技术、自适应链路技术等。

After the initial inoculation of measles vaccine and the effects of multiple cropping well, but with age, measles IgG antibody level decreased gradually, to deal with high-grade primary school (grades 4 to 6), junior high, high school students to carry out measles vaccination and immunization do good response, so the prevention and control of epidemics and outbreaks of measles.

经过麻疹疫苗初次接种与复种后效果良好，但随着年龄的增长，麻疹IgG抗体水平逐渐下降，应对小学高年级（4~6年级）、初中生、高中生进行麻疹疫苗强化免疫以及做好应急工作，从而预防和控制麻疹的流行和暴发。

objective to discuss perioperative complication and management of patient with high risk copd following esophagectomy.methods 45 patients with high risk copd underwent esophagectomy with epidural block combined with general anesthesia.perioperative treatment included smoking cessation,chest physiotherapy,prevention and control of infection of air way and appropriate bronchodilators of air way,breathing exercises,nutrition support and oxygen therapy.painkiller was instilled after surgery,early exercises,ensuring unobstruction of the air way,mechanical ventilation was applied when needed.results 3 had hypoxaemia in operation.after surgery,all patients had spo2 somewhat declined.6 had lung infection.6 were removed of bronchial secretion by bronchoscope.2 were supported by ventilator by using intubation.2 underwent tracheotomy.1 had disturbances of acid base balance and treated by using hydrochloric acid muriatic acid.all patients recovered rather smoothly and discharged from hospital.conclusion high risk copd is not the absolute contraindication of esophagectomy.active management before and after surgery ensures the safety and recovery of patients.

目的 探讨重度慢性阻塞性肺疾病简称慢阻肺病人食管切除术围手术期常见并发症及其处理。方法 45例重度慢阻肺的病人在全麻联合硬膜外阻滞下进行开胸食管切除手术，围手术期处理包括术前戒烟、胸部理疗、预防和控制呼吸道感染、解痉化痰、呼吸功能锻炼、营养支持和氧疗；术后硬膜外镇痛、早期锻炼、保持呼吸道通畅，部分病人予以呼吸支持。结果术中3例出现低氧血症。术后所有病人pao2均有不同程度的下降，6例出现肺部感染，6例行纤维支气管镜吸痰，2例通过气管插管给予呼吸机支持，2例行气管切开术，1例酸碱平衡紊乱使用盐酸精氨酸治疗。所有病人均痊愈出院。结论重度慢阻肺病人并非开胸食管切除手术的绝对禁忌证，积极的术前准备和严格的术后管理可减少和控制术后急性发作，有助于确保此类病人的围手术期安全和康复。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。