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The characteristic of power transmission line project is a large investment, a long construction period and technological complexity.

输变电线路工程项目具有工程耗资大、建设周期长和技术复杂的特点，所以输变电线路工程的建设具有高风险性。

The power direction unit has the characteristic of a straight line running along the middle line and its extensions.

功率方向单元有从中线到其延长线这条直线的特征。

Abstract］ Objective:To study the effect of berberine on adhesion characteristic of PG cell line and to investigate possible mechanism of inhibiting tumor metastasis of berberine.

目的：研究小檗碱对高转移性人巨细胞肺癌PG细胞黏附特性的影响，以探讨其抑制肿瘤侵袭转移的可能机制。

The process of automation development in cement industry is introduced and the characteristic of the cement product line and the requirement of technology are analyzed. The plan of network and the thought of automatic design are presented.

介绍了水泥行业自动化发展的历程，并对水泥回转窑生产线的工艺特点、技术要求进行了分析，给出了组网方案和自动化设计思路。

Scalar network analyzer is a kind of intelligent instrument based on frequency sweep test technology that used to measure the amplitude-frequent cy characteristic of linear system.

标量网络分析仪是一种基于扫频测量技术，用于测量线性系统幅频特性的智能化仪器。

This course will mainly discuss on time-domain analysis and frequency-domain analysis of determined signal, description and characteristic of linear time-invariant system, as well as time-domain analysis and transformation domain analysis of signal via linear time-invariant system.

本课程主要讨论确定性信号的时域和频域分析，线性时不变系统的描述与特性，以及信号通过线性时不变系统的时域分析与变换域分析。

Based on the analysis of interactions between different systems in the network, it is proved that, for a class of complicated linear switched system network, an equivalent model of ordinary linear switched system exists and the corresponding model is given.(4) Block simulation model of linear switched system is established in Matlab/Simulink environment and, moreover, a linear switched system simulation tool with the function of model automatic generation is developed. With the aid of this simulation tool, influence caused by switching sets on stability characteristic of linear switched system is investigated.

对线性切换系统网络中各系统之间的交互作用作了分析，在此基础上证明了一类复杂线性切换系统网络可用等价的线性切换系统模型来表示，并得到了该等价模型；（4）在Matlab/Simulink环境下建立了线性切换系统的框图仿真模型，并进一步开发了具备模型自动生成功能的线性切换系统仿真工具。

The status of the flow in manifold systems will directly affect the efficiency and security of an exchanger. With the help of discrete model, the characteristic of the flow in manifold systems will be got.

流体在并联管组换热器中的流动状况将直接影响到换热器运行的效率和安全性，通过离散模型计算方法可得到流动工质在并联管组内的流动特性。

The flow characteristic of intake manifold has sensitively influence on engine, including economy performance, dynamical performance and the level of injurant emission.

其流动特性对发动机性能的影响十分敏感，其优劣影响到汽车的经济性、动力性和有害物排放的水平。

The calculated results of the discrete model accord with the experimental data well. Compared with a simple continual model, the discrete model is true of the characteristic of the flow in manifold systems, and it also shows the availability of the way to use BP neural networks to measure the key coefficient of the discrete model.

通过离散模型计算得出的结果与实验数据符合良好，说明与简化的连续模型相比，离散模型是一种更为符合并联管组流动特性的理论模型，同时也表明了用BP算法来确定离散模型关键系数的有效性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。