单叶的

The relation between rectilinear generators of hyperboloid of one sheet and its asymptotic cone are discussed.

给出并证明了单叶双曲面的直母线的若干性质，讨论了单叶双曲面与其渐近锥面的直母线之间的关系。

A center point and nodal axis of hyperboloid of one sheet are found out, and the discriminance to distinguish which one of two reguluses belongs to the motion screw system is given.

给出了单叶双曲面的中心和主轴以及判别单叶双曲面上哪一族是运动螺旋轴线所分布的方法。

As a result of analysis to many of the results of experiment, checked up on specimens, field investigation and combining with the theories of palaeobotany, comparative morphology, evolutional morphology of vascular plants and taxonomy, it can be concluded as following: the primitive sorts of Cycadaceae are the sorts that pinnate leafs are dichotomy; among these, the sort that pinnate leafs are tripinnate-dichotomy is most primitive, from this sort gradually evolve to bipinnate-dichotomy, to only for monopinnate-dichotomy, from this sort evolve to the sorts that pinnate leafs are simply pinna; among the sorts of simply pinna, the species that segments of megasporophyll possess much more triplicate to monodichotomy are most primitive.

经过大量的实验结果分析、查阅标本和野外调查，结合古植物学、比较形态学、演化植物学和分类学等理论进行分析，认为苏铁科原始的类型为羽叶呈二歧状分叉的种类，其中最原始的又是羽叶呈三回二歧状分叉的种类，从这个羽叶类型逐渐演化出一回二歧状分叉的羽叶类型，再演化出羽叶为单羽状的类型；而单羽状叶的类群中，又以大孢子叶侧裂片具三回、二回及一回二歧状分叉数量多的种类为最原始，而侧裂片二歧状分叉数量少的为较进化，侧裂片无二歧分叉的如拳叶苏铁类为最进化的种类。

Amongleaves of various stalk positions,flag and penult leaf had the highestassimilating capacity.

不同叶位间比较，以旗叶和倒二叶的同化功能最强，占单茎同化量的60％以上，倒三叶以下同化能力迅速衰减。

The inner radius of univalence for some particular domains such as triangles, regular polygons and angle sectors have been obtained. Part estimations of inner radius of univalence for ellipses and rectangles have also been obtained.

对三角形，正多边形，角形区域，双曲线围成的区域的单叶性内径已经得到了精确的数值，对于椭圆，矩形的单叶性内径也得到了部分估计。

In the first part,we give the inner radius of univalency for fan-shaped domains and for quadrilateral domains with vertexes on a circumference and sides forming the sequence abba .

在第一部分中，我们给出了扇形和四边为abba形式的圆内接四边形的单叶性内径，并给出了长方形区域单叶性内径的下界估计。

This chapter is dedicated to the study of the properties of close-to-convex univalent harmonic mappings.

在这一章中，我们主要研究了单叶调和映照的近于凸子族，首先给出了近于凸单叶调和映照与正实部解析函数之间的一个关系。

This study was made to develop an accurate, simple and rapid method for estimating individual leaf area of wetland taro 〔Colocasia esculenta Schott〕 under different growth periods in Taiwan. The experiment was conducted in the fall crop of 1991 at Taiwan Agricultural Research Institute.

本研究之主要目的在探讨台湾本地栽培种槟榔心芋於水田栽培时之单叶面积的简易估算方法，藉不同取样时期的叶长及叶宽之测量，以寻找出一套精确、简单、迅速且适用於整个生育期之简易方式来估算叶面积。

The article has described the simplicity machining method of the tilted edge fingerlike gear cutter with uniparted hyperboloid matching tooth shape and the straight generatrix of the uniparted hyperboloid as the blade curve.

介绍用单叶双曲面拟合齿形，以单叶双曲面的直母线作刀刃曲线，用普通工具磨即可完成的斜刃指状齿轮铣刀的简易加工方法。

The contents of tannin in two non-host plants were more than in the host plants, so regard that tannin was the important factor of repressing the feeding of Tetranychus viennensis.

在两种非寄主植物叶片中单宁的相对含量远远高于在寄土植物叶片中的含量(麻栎9.60％，大叶黄杨23.85％)，认为单宁是阻碍山楂叶螨取食的重要因子。

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。