等距的

At first, the kind of high-speed craft and its current situation are introduced in this paper. Through analyze and compare the characteristics of their performance, three kinds of high-speed craft are selected to be optimized. They are hydrofoil-gliding craft, wave-piercing catamaran and frigate, which power equipment of propulsion system are the common screw, pitch-adjustable screw and water-jet propeller.

本文首先介绍了高速船种类及其推进器的发展现状，通过分析比较各种船型的性能特点，选取了三种典型的高速船(翼滑艇、穿浪艇和护卫舰)并分别以普通螺旋桨、可调距螺旋桨和喷水推进器作为三种船型等动力装置。

The characteristic parameters of tree belt, such as tree belt width, density, average canopy density, height, and distance from the source to the tree belts were included in the formula.

为了克服林带声衰减量计算过于简化而引起的公路交通噪声预测精度降低的不足，基于植物内部结构及吸声、散射机理的分析，建立了高速公路林带声衰减量计算公式，公式中包含了林带宽度、密度、平均灌幅、高度和林带近路侧距公路中心线距离等特征参数。

Then in order to improve the efficiency and accuracy of numerical computation, the author developed hybrid spline interpolation, automatically varia...

然后为了提高数值计算的精度和效率，作者又根据二次样条的特点，提出了杂交样条插值、可变节距样条求积和自适应的样条求导等新方法。

Thunbergii trees were established, and the sun survivorship curves were drawn with field data. The results showed that in the three plots, the height and basal diameter growth of regenerated young P. thunbergii trees had exponential, linear, and quadratic functional relations with age and the age structure was of spindle, discrete, and pyramid types, respectively. Most of the regenerated young trees were distrbuted at 0.3-1.2 m from their nearest standing trees, and the individuals of the young trees decreased near to or far from the nearest standing trees. Inplots Ⅰ and Ⅲ, the expected average life of regenerated young P. thunbergii trees had a decreasing trend with their increasing age, and the survival number of the population also decreased with increasing population age. The survivorship craves of regenerated young P. thunbergii trees in the two plots approximated to the type of Deevey Ⅱ, indicating that the young P. thunbergii populations in the plots were at stable development stage. The population structure of regenerated young P. thunbergii trees in plot Ⅱ was lesser integral, suggesting that the population was of declining types being related to human disturbance, slope and other environmental factors.

结果表明：(1) 3个样地中幼龄植株高生长、基径生长与年龄均分别呈指数函数、直线和二次函数关系；(2) 3个样地黑松幼龄植株年龄结构存在着明显差异，分别表现为纺锤形、残缺型和金字塔型；(3)幼龄植株主要集中分布在距最近立木0.3~1.2m，离立木越近或越远幼龄植株均逐渐减少；(4)对样地Ⅰ和样地Ⅲ黑松幼龄植株生命表和存活曲线的分析表明，随年龄的增加，黑松幼龄植株生命期望值基本上呈递减趋势，黑松幼龄植株种群存活数也随着年龄的增加而降低；样地Ⅰ和样地Ⅲ黑松幼龄植株种群存活曲线近似于Deevey Ⅱ型，表明2个样地黑松幼龄植株种群处于稳定发展阶段；(5)样地Ⅱ幼龄植株种群结构很不完整，表明该种群属于衰退型，与人为干扰及坡度等有关。

All center-to-center spacing of holes, screw threads and grooves on the board should be dimensioned.

在板上用作穿螺钉的孔、槽等的中心距都应注出，而且由于板的基本

The investigation results show that the shrubs diameter apart from root 50 mm mostly shall not exceed 15mm, such as Caragana Korshinskii Kom, Vitex, Fourfold Acacia, and Grewia biloba var.parviflora. The moisture content of the above shrubs is about 55%, 55%, 61% and 50% separately in late autumn and winter when they are reaped.

通过实地调查研究和统计分析适值收割的柠条等几种常见灌木的距地50 mm左右处的直径一般不超过15 mm，适宜收割期间柠条含水率为55%左右，荆条含水率为55%左右，四倍体刺槐含水率为61%左右，扁担木含水率为50%左右。

Remains of ancient culture and political county is very intensive, show soil more than 8,000 years ago 1.3 million years ago as the shovel teeth, and other large and medium-sized Hipparion extinction of a wide range of vertebrate paleontology specimens, shocked the world, known as the paleontology of the "Garden of Eden ."

和政县古文化遗存十分密集，现出土的8000多件距今1.3万年前的铲齿象、三趾马等大中型灭绝古脊椎动物标本种类繁多，震惊世界，被誉为古生物的&伊甸园&。

Factors affecting wind deflection caused discharge include wind speed, wind pressure ununiformity coefficient ,induded angle between wind and conductor,and transmission line parameters,etc.

风偏放电的影响因素有风速、风压不均匀系数、风与导线夹角、输电线路的参数等，通过对这些因素的逐一分析，明确了风速、风压不均匀系数和垂直档距对绝缘子风偏角影响较大。

In order to enhance inspection accuracy, it is necessary to choice different cylinder test benches according to automobile types, axle load, vehicle radius and axle space.

为了提高检测的准确性，应根据车辆的类型、荷重、车轮半径、轴距等条件选择相应的滚筒台进行检测。

The paper summarizes systematically the existing state of the structure of slide plate of turnout at home and abroad, improves and optimizes the structure of slide plate of speed-up turnout against the existing problems of slide plate of speed-up turnout such as failure tightening force, cracks in spring shim and pin, large surface resistance of slide bed-plate, difficulty in gauge adjusting and so on.

本文较为系统地总结了国内外道岔用滑床板的结构现状，针对提速道岔用滑床板存在的扣压力失效、弹片与销钉出现裂纹、滑床台板表面阻力大、轨距调整困难等问题，改进和优化了提速道岔用滑床板的结构。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。