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The authors performed 3D photographic measurement on the technical moves of ZHANG Wen-xiu as an excellent female hammer thrower in China to get relatively comprehensive body movement data by using two JVC3000 high-speed cameras, screened and analyzed the data by using SPSS software, and revealed the following findings: in terms of such technical parameters as spinning time, spinning track and spinning speed, there were some problems with this player, which restricted the enhancement of her performance, such as the double leg supporting time was shorter than the single leg supporting time; the angle of inclination of the track of various swirls (espe-cially the first swirl) was somewhat too big; the accelerating process was too short; too much attention was paid to acceleration at the single leg supporting stage; the spinning at the double leg supporting stage was too fast; the sus-tainable accelerating power was not high.

摘 要：采用两台JVC3000高速摄像机对中国女子链球优秀运动员张文秀的技术动作进行三维摄影测量，获得较为全面的人体运动学数据；运用SPSS软件对数据进行筛选和相关分析，发现该运动员在旋转时间、轨迹和速度等技术参数方面存在着一些制约成绩提高的问题，诸如双支撑时间短于单支撑时间、各圈(尤其第1圈)的轨迹倾角偏大、加速过程太短、单支撑阶段过于强调加速及双支撑阶段旋转过快、持续加速能力不强等。

the authors performed 3d photographic measurement on the technical moves of zhang wen-xiu as an excellent female hammer thrower in china to get relatively comprehensive body movement data by using two jvc3000 high-speed cameras, screened and analyzed the data by using spss software, and revealed the following findings: in terms of such technical parameters as spinning time, spinning track and spinning speed, there were some problems with this player, which restricted the enhancement of her performance, such as the double leg supporting time was shorter than the single leg supporting time; the angle of inclination of the track of various swirls was somewhat too big; the accelerating process was too short; too much attention was paid to acceleration at the single leg supporting stage; the spinning at the double leg supporting stage was too fast; the sustainable accelerating power was not high.

运动生物力学在乒乓球运动中的应用与。。。对投掷运动员运动损伤的调查分析与预。。。《运动防病治病讲座》健身运动的基本。。。都市运动研究：理论传统的界定和中国。。。《运动防病治病讲座》中年人的健身运。。。体校学生特征性运动自信心和运动动机。。。中国优秀沙滩排球运动员运动损伤流行。。。摘要：采用两台jvc3000高速摄像机对中国女子链球优秀运动员张文秀的技术动作进行三维摄影测量，获得较为全面的人体运动学数据；运用spss软件对数据进行筛选和相关分析，发现该运动员在旋转时间、轨迹和速度等技术参数方面存在着一些制约成绩提高的问题，诸如双支撑时间短于单支撑时间、各圈(尤其第1圈)的轨迹倾角偏大、加速过程太短、单支撑阶段过于强调加速及双支撑阶段旋转过快、持续加速能力不强等。

The experiments of series thermal analysis point out that this kind of plasticizer is beneficial to the thermal decomposition of double base composite propellant and hexogen, and its application in the modified double base propellants could improve combustion properties.

介绍了一种新型含能的叠氮类增塑剂PDADN 合成、结构及物理化学性质，系列热分析实验表明，它有利于双基组分及黑索今的热分解，指出它在改性双基推进剂中将可改善燃烧性能。

A pair of primers that contained flanking hydropathic amino acid codons were synthesized, to amply the sequence coding for 10~34 aa in the precursor sequence. The amplified fragment was inserted into pRSET-A to generate the first double repeat of the precursor gene. By utilizing a pair of isocaudamer BamH I and Bgl II sites, and another downstream Hind III site of plasmid pRSET-A, following a series of simple double digestions and ligation of the resulted products, a series of repeat (3, 4 and 6) precursor peptide fragment genes were derived.

本实验设计一对两侧含编码疏水性氨基酸密码子的引物，经过扩增前导序列10~34aa基因序列，并重新克隆入质粒pRSET-A构建串联二聚体后，再利用质粒pRSET-A的BamH I / Bgl II同尾酶克隆位点，经一系列简单的酶切和连接，快速构建这一前导肽中不含组氨酸标签序列的串联多聚体基因，并成功表达其六聚体重组蛋白。

Consisted of single, double vascular bundle, transition types between them, but given priority to double vascular bundle; the epidermal cell consisted of cutin layer; the hypodermis consisted of typical two-layer of parenchyma cells arranged continuously or discontinuously.

云南松针叶的维管束以双维管束为主，同时亦有单维管束以及介于单、双维管束之间的过渡类型；皮下层为典型的二型皮下层；表皮层的角质层明显；树脂道多为典型的外生型。

In the process of moving from single-sustenance to double- sustenance, the angel of body tends to enlarge; in the process of moving from double-sustenance to single-sustenance, the angle of body tends to decrease; when the right leg is kicking on the ice, the center of gravity is just moved to the upper point of fulcrum, which means the center of gravity is vertical to fulcrum, while the left leg starts to kick on the ice when center of gravity completely surpass fulcrum; right knife touches the front ice of the supporting foot, the left knife touches the interior and front ice; small momentum variation coefficient and good effect of momentum move show the rationality of action and abundance of

单支撑阶段向双支撑阶段过渡过程中，躯干角度有增大趋势；右双支撑阶段向单支撑阶段过渡过程中，躯干角度有下降趋势；右腿蹬冰时重心刚好前移至支点的正上方，即重心与支点相垂直，而左腿则是在重心完全超越支点后一段时间才开始的蹬冰；右刀着冰向支撑脚前方下刀，左刀着冰向内侧前方跨出；动量变异系数小，动量转移效果好，反映了动作结构的合理性和能量利用的充分性；目前世界优秀运动员各环节的动量分配比例较以前均有较大幅度的提高；环节动量变异系数遵循着大环节动量变异系数小、小环节动量变异系数大的原则是较合理的。

In this method, drill the double holes in the two sides of the point to be determined in welded joints, load material bridge by an indentor until it is broken, record the response between applied load and indentor displacement. We can call this method as double holes microshear test.

在被测材料的小区域两侧开两小孔，剪切刀具从其中一孔对被测区域的材料加载直到破坏，记录加载过程中的载荷位移曲线。

The purpose is to reveal the rules and features of double-push, contribute to a correct understanding of double-push, and seek a more advanced and effort-saving technique for inline skating.

目的是揭示速度轮滑双蹬技术的规律和特征，为正确理解速度轮滑双蹬技术动作原理奠定基础，为寻找更先进和省力的速度轮滑技术提供科学依据。

Specialised double glazing requires a larger air gap between the inner and outer glass than normal double glazing.

镶嵌双层特别的玻璃在内外玻璃间比普通双层玻璃间需要一个较大的空气间隙。

Input to the function is the variable X of type double and the result is also of type double.

函数的参数是浮点数 X，其返回值也是浮点数。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐