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When water is confined in tubes of very small bore, the forces of cohesion (the attraction between water molecules) are so great that the strength of a column of water compares with the strength of a steel wire of the same diameter.

当水被限制在内径很小的管道中时,内聚压力(水分子之间的相互吸引力)是如此之大以致一支水柱的强度相当于一根直径相同的钢丝的强度。

In this study,~3000 bp of 28S rDNA sequences from nine tetranychids, two tenuipalpids and two acarid mites were used to probe the essence of this gene and its applicability to the delineation of phylogenetic relationship of these species.

本文分析9种叶蟎、2种拟叶蟎及2种根蟎28S rDNA约3000个核苷酸的序列特性,并评估此基因在蟎蜱高阶亲缘关系的应用。28S rDNA序列在蟎蜱的变异并不是逢机的,其核心区段变异较其两侧的展延区小,且分类关系离越远其序列差异就越大。

Pitch circle diameter: d = mz = 3X12 = 36 Tooth crown heights: ha = m (f0 + x)= 3X (l +0.5)= 4.5 Tooth High: hf = m (f0 + cx)= 3X (l +0.25-0.5)= 2.25 Tooth full height: h = ha + hf = 4.5 +2.25 = 6.75 Addendum circle Chemical pumps diameter: Da = d +2 ha = 36 +2 X4.5 = 45 Fixed string tooth thickness: Sxn = m (π/ 2 * cos2a + xsin2a)= 3X (1.387 +0.6428 X0.5)= 5.125 Fixed string of high gear tooth thickness measurement: hxn = m (π/ 8 * sin2a + xsin2a)= 3X (0.7476X0.117X0.5)= 2.42 Modulus coefficient x0.5 m3 O20 ° pressure angle tooth thickness Sxn5.12 fixed string Addendum Coefficient string f1 fixed gear tooth thickness measurement most high hxn2.42 Teeth z12 2, shaft wear and tear maintenance: Axis gear pump wear is mainly because with the support roller shaft at both ends between the friction and wear, so that smaller shaft diameter.

分度圆直径:d=mz=3X12=36 齿顶高:ha=m(f0+x)=3X(l+0.5)=4.5 齿根高:hf=m(f0+c-x)=3X(l+0.25-0.5)=2.25 齿全高:h=ha+hf=4.5+2.25=6.75 齿顶圆直径:Da=d+2ha=36+2X4.5=45 固定弦齿厚:Sxn=m(π/2*cos2a+xsin2a)=3X(1.387+0.6428X0.5)=5.125 固定弦齿厚测量用齿高:hxn=m(π/8*sin2a+xsin2a)=3X(0.7476X0.117X0.5)=2.42 模数m3变位系数x0.5 齿形角o20°固定弦齿厚Sxn5.12 齿顶高系数f1固定弦齿厚测最齿高hxn2.42 齿数z12 2、轴的磨损维修:齿轮泵中轴的磨损主要是因为轴两端与支撑滚针间的摩擦磨损,使轴径变小。

50Mmol/L NaCl stress had no influence on level of ATP in root of Ginkgo andAilanthus.Level of ATP in roots of Ginkgo,Ailanthus and Robinia decreased greatly under200mmol/L NaCl stress.The extent of decrease of ATP level accord to plant salt tolerance:Ginkgo is more salt tolerance,and ATP decreases more slowly than that of Ailanthus andRobinia.

11.50mmol/L的NaCl胁迫没有引起银杏和臭椿根尖ATP水平的明显改变;200mmol/L的NaCl胁迫引起银杏、刺槐和臭椿ATP水平指数性的衰减,ATP的下降幅度的变化与植物耐盐性一致:耐盐性强的银杏,ATP的下降幅度明显比刺槐和臭椿小。

The results offer the condition that these plants of Ajuga could be distinguished by size and ornamentation of exhymenine.

结果表明,同属三种植物的形态特征相似,可通过叶形及花期是否具基生叶,花萼的形态,花冠颜色以及茎的生长方式和植株被毛情况等予以鉴别;通过对三种植物的花、根、茎、叶及全草粉末的组织构造观察,认为种间差异较小,可依据毛茸的分布及形态特征和茎的木化程度不同加以鉴别;对三者花粉粒进行了扫描电镜观察,发现其大小和外壁纹饰具有明显差异,为三者的鉴别提供了有力的依据,也为该属的分类及植物花粉形态研究提供了花粉形态学方面的资料。

Eurasian herb having small yellow flowers and red roots formerly an important source of the dye alizarin .

生于欧亚的一种药草,开小黄花,根呈红色,以前是染色茜素的重要来源。

Arban Variations on Opera Vois-tu la neige qui brille?: Andante quais Allegretto, Variations 1 and 2, Lento, Allegro, any edition.

變奏曲 -根據歌劇《美麗的雪景》,需演奏:近似小快板的行板、變奏 I 和 II、尾聲和快板,可選任何版本。

A division of nonflowering plants characterized by rhizoids rather than true roots and having little or no organized vascular tissue and showing alternation of generations between gamete-bearing forms and spore-bearing forms; comprises true mosses and liverworts and hornworts.

无花植物的一个亚部,以假根而非真根为特点,有小的或没有维管组织,有结合体和孢子体的世代交替;由苔藓类组成。

ObjectiveTo provide a basis for the research about the relation between the structure and its bioactivities of polysaccharides from Ampelopsis grossedentata.

作者:罗祖友陈根洪郑小江吴谋成目的对藤茶水溶性多糖进行分离纯化得到AGP-3组分,并对其结构进行初步的鉴定,为藤茶多糖结构与生物活性关系的研究奠定基础

His head was lying on a bulging root close to the stem: his feet reached to a small sack or bag half full of acorns.

他把头枕在树干边凸起的根块上,脚伸向已装满一半橡果的小包或小袋。

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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。

The new PS20 solar power tower collected sunlight through mirrors known as "heliostats" to produce steam that is converted into electricity by a turbine in Sanlucar la Mayor, Spain, Wednesday.

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