主要成分

Fromthe point of view of chemical components,α-cellulose content for differentage-degrees bamboo is mostly the same,slightly increasing with the growth ofage,lignin content increases with the growth of age,the contents of extract,hemicellulose,polysaccharose,mineral elememts decrease with the growth ofage;the result shows the electric conductivity of bamboo is mainly decided bythe content of mineral elements,with the growth of age,volume resistivitybecomes great.pH value shows acid,acidity decreases with the growth of age,this is mainly due to the decrease of fraction of bamboo parenchyma with thegrowth of age.

从化学成分角度来说，不同年龄竹材α-纤维素含量差异不大，一般随着年龄增大而增大；木质素含量随着年龄增大而增大；抽提物、半纤维素、聚戊糖、灰分含量随着年龄增大而降低；研究表明竹材的导电性主要由矿质元素含量大小决定，随着年龄增大，体积电阻率越来越大；pH值呈酸性，酸性随着年龄增大而减弱，这主要由于竹材薄壁组织比量随着年龄增加而减少，内含物如淀粉减少，导致酸性减弱。

The chemical constituents from Primulaceae plants are mainly flavonoids, terpenoids, sterols, organic acids, quinines, etc. These plants have effects of lowering serum uric acid level in mice, promoting bile secretion in rats, reducing bile pigment stones formation rate, immune regulation and so on.

报春花科植物中主要化学成分有黄酮类、萜类、甾醇类、有机酸类、醌类等；药理活性主要有降低小鼠的血清尿酸水平，促进大鼠胆汁分泌，减少胆色素结石的成石率，免疫调节功能等。

Analysis of chiru food plants showed no marked difference in nutritive values at this season between the calving grounds and the southern range.

我们对藏羚羊主要采食的植物的营养成分进行分析，没有发现这个区域和其南部其他区域的差异，所以食物可能不是藏羚羊迁徙的主要原因。

Female birds also showed overt preferences for the odor of male preen gland secretions or the 3-alkanol blend equivalent preened onto the plumage of a male over that of female counterparts.

另外一方面，以往认为尾脂腺在鸟类中主要起到羽毛防水和折射不同波长光的效用，化学研究上也主要集中在对于尾脂腺排泄的蜡脂成分的分析上。

These plants have effects of lowering serum uric acid level in mice, promoting bile secretion in rats, reducing bile pigment stones formation rate, immune regulation and so on.

报春花科植物中主要化学成分有黄酮类、萜类、甾醇类、有机酸类、醌类等；药理活性主要有降低小鼠的血清尿酸水平，促进大鼠胆汁分泌，减少胆色素结石的成石率，免疫调节功能等。

As a bionic sense technique, the AITS is composed of three parts, namely the cross-sensitive sensors and their array, self-study specialist database and intelligent recognition. The voltammetric and the potentiometric techniques are two main test methods. The sensitive materials include noble metals, rare earth metals, lipids and lipids polymer, chalcogenide glass materials, conductive polymers and other materials such as graphite paste, phthalocyanin, Prussia blue etc. The PCA and the ANN are the primary pattern recognition tools in intelligent recognition.

作为一种仿生感觉技术，人工智能味觉系统是由交互感应电极及阵列、自学习专家数据库和智能模式识别三部分构成；电位法和伏安法是两类主要的传感方法；传感器材料包括贵金属及稀土金属、类脂/聚合物、硫属玻璃、导电聚合物以及其它如碳糊、酞菁、普鲁士蓝等；主成分分析和人工神经网络是智能识别过程中主要的模式识别工具。

In the Ming Dynasty published many monographs and monumental works, which, as a component of our traditional military culture and the fruit of the development of firearms technology, are characterized in gunpowder prescription technology including compatibility principles of gunpowder, prescriptions of the firing charge and multi-composition gunpowder, and ballistic hit technology, mainly about scientific design and manufacturing of blunderbusses, the ranges in various angles of depression and elevation, the standards of range and factors which have influence the range.

它作为我国传统军事文化的一个组成部分，火器技术发展的结晶，尤在火药配方技术、弹道命中技术上多独具自己的特色。火药配方技术主要有火药配伍原则、发射火药配方和多成分火药配方；火器弹道命中技术主要有科学设计与制造铳炮、不同俯仰角的射程、射程量度标准及影响射程的因素等。

The main material is PVC leatheroid and natural skin avoiding burning and bacillus .

公司生产的主要产品有六大类35个品种，主要原料是含有阻燃及除味除菌成分的PVC人造革和真皮。

In basic properties of silver grass, the basic biology construction, fiber morphology, buffering capacity , surface wet ability and longitudinal tensile strength was mainly studied; in manufacturing process of SPB, the effect of board density and UF addition on physical and mechanical properties of SPB was mainly discussed, and By means of test of orthogonal experimental design and searching test, the relationship between moisture content , hot-pressing temperature , water-proofing agent addition and the TS of SPB was studied in detail. Through the study of the test production process of SPB, the best technological conditions were determined.

在荻草基本性质方面，主要研究了荻草的基本生物构造、纤维形态、化学成分、酸碱缓冲容量以及荻草的表面润湿性和纵向抗拉强度；在荻草刨花板制造工艺方面，主要讨论了不同密度、施胶量与板材物理力学性能之间的关系，并通过正交试验的方法深入研究了热压温度、板坯含水率以及防水剂施胶量对荻草刨花板吸水厚度膨胀率的影响，通过研究确定了较佳的试验生产荻草刨花板的工艺条件。

In order to screen out fine pastures adapted to the east seashores of China,Spartina patens mutant lines induced by low energy heavy ion were grown in a simulating the seashore condition outdoors.A comparison of biomass and photosynthetic ability among 10 mutant lines had been carried out,contents of main organic and inorganic nutritients and main heavy metals in above-ground parts of each line were assayed.

为从经低能重离子诱变的狐米草突变系中筛选出适合在滩涂生长、营养丰富的牧草株系，在前文比较了模拟滩涂环境种植的各突变系生物量和光合能力的基础上，本文进一步检测了几种主要有机和无机营养成分含量以及几种主要重金属污染元素在各突变系地上部分的积累量。

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。