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The most common form of DNA in a cell is in a double helix structure, in which two individual DNA strands twist around each other in a right-handed spiral.

最常见的形式在细胞的DNA是在双螺旋结构,其中两个单独的DNA链捻周围对方用右手螺旋

Objective To analyse the appearance of cholesteatomtous tympanitis on Spiral CT and clinical application.

目的:分析胆脂瘤型中耳炎的螺旋CT表现,探讨螺旋CT在临床的应用价值。

Besides, the relationships among the tooth numbers and the helical angles of the helical type shaving cutter, the tooth surface deviations and tooth contact conditions are also investigated.

同时,本论文也根据齿面接触分析之结果探讨创成Helipoid齿轮的螺旋型刮刨刀之齿数、螺旋角与齿面差异以及齿面接触情形间的关系。

By pulling the pro- tective cover toward the direction of subscriber premis- es, the spiral section of the cable can be drawn out from the cover's tapered end without being uncoiled.

通过将保护盖朝用户房屋方向拉,光缆的螺旋段就可以从盖子的锥形末端拉出来而不会解开螺旋

In this paper,the kinematic equations of flow of Newtonian fluid of helical flow in eccentric annulus were transformed by the method of undetermined coefficient,the calculation formula of pressure gradient of flow of Newtonian fluid of helical flow in eccentric annulus was obtained.

本研究利用待定系数法对 Newton 流体偏心环空螺旋流动的运动方程进行了变换,得到了给定流量情况下 Newton 流体偏心环空螺旋流动的压力梯度的计算公式。

A new method, step-search-diameter ,is presented to calculate the diameter of undirected double-loop networks G.

提出新的无向双环网络G的直径求解法———分步法;并得到一种新的直观图———螺旋环,研究了螺旋环的性质;给出了无向双环网络的直径d的显式公式;给出了N,s都固定的直径算法;在N固定,且2≤r

Based on variational principle and split-based interpolation finite element method for fast and accurate analysis of normal mode helical antenna,Combination of genetic algorithm and then load the normal mode helical antenna loaded on the value of lumped elements,Load location,and matching network integrated optimal design parameters,And using Sherman-morrisorr Woodbury formula to quickly solce the load component values and load the changed position of the impedance matrix equation to improve the efficiency of optimized design.

采用基于变分原理和剖分插值为基础的有限元法来快速精确分析法向模螺旋天线,然后结合遗传算法对加载法向模螺旋天线上的加载集总元件的值、加载位置以及匹配网络参数进行一体化优化设计,并采用Sherman-Morrisorr Woodbury公式来快速求解加载元件值和加载位置改变后的阻抗矩阵方程,提高优化设计的效率。

Investigation and discussion is various the portrait equipment having the three-dimensional body imaging function applies to hitting the target clinically, many row CT are worth to the application that the bone and arthrotrauma fracture 3-D rebuild, helix CT valuation in cultivating operation in the tooth, helix CT 3

探讨多种具有三维立体成像功能的影像设备在临床中的应用,多排CT对骨与关节外伤性骨折三维重建的应用价值,螺旋CT在牙种植手术中的评价,螺旋CT三维重建在胫骨平台骨折中的应用,三维重建技术的实现可以准确地提供影像诊断和医疗决策。

Investigation and discussion is various the portrait equipment having the three-dimensional body imaging function applies to hitting the target clinically, many row CT are worth to the application that the bone and arthrotrauma fracture 3-D rebuild, helix CT valuation in cultivating operation in the tooth, helix CT 3-D rebuilds in application in tibia platform fracture , 3-D rebuilds the technology realization to be able to provide the portrait diagnose and the medical treatment decision-making accurately.

中国医科大学临床医学七年制,沈阳, 110001)择要:探讨多种具有三维立体成像功用的影像装备在临床中的应用,多排CT对骨与关节外伤性骨折三维重建的应用价值,螺旋CT在牙种植手术中的评价,螺旋CT三维重建在胫骨平台骨折中的应用,三维重建技术的实现可以准确地提供影像诊断和医疗决策。

The results are as below: 1. In Brasenia, 3 sepal primordia and 3 petal primordia initiated stimultaneously in each whorl. The first six stamen primordial initiated in a whorl stimultaneously, and the succeedings ones initiated in irregular spirals. Ascidiate carpel numerous, initiated in spirals.

结果表明: 1。莼菜的萼片和花瓣各3枚,都为轮状同时发生;雄蕊多数,除最早发生的6枚雄蕊原基为轮状同时发生外,其余均为螺旋状向心式发生;心皮多数,螺旋状向心式发生,为囊状型心皮。

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