前轴

Three cross-sections were made through crown and gingiva of the model tooth. Curve functions of axial buccal crown and gingiva contour of each section were acquired by means of curve fitting, and the angle of emergence pofile was calculated, which represents the degree of undercut.

以下颌第二前磨牙为研究对象，在牙列模型上通过牙冠部、牙龈作3个纵断面，用曲线拟和的方法得到每个断面的牙齿轴面外形及相应牙龈外形的曲线方程，以此分析两者之间的关系并计算牙冠起始外形角度，即倒凹程度的大小。

MAIN OUTCOME MEASURES: Stress images and peak stress of pedicle screws under lumbar axial compression, anteflexion, extension, lateral bending and rotation.

主要观察指标：椎弓根螺钉在轴向压缩、前屈、后伸、侧屈和旋转等各种生理载荷下的应力云图和峰值。

The displacement pick-up was put into C3/4 intervertebral space and axis pressure (0～160N) homolateral-bending (0～1.5Nm), oppositeside-bending (0～1.5Nm), back-extending (0～1.5Nm) and anteflexion (0～1.5Nm) were respectively loaded. After having measured the morphological changes of C3/4 intervertebral foramena in C5/6 intergrity group, discectomy group and replaced group, the changes in different groups were compared.

将位移传感器置入C3/4椎间孔内，在颈椎标本上施加轴向（0～160N）、同侧弯（0～1.5Nm）、对侧弯（0～1.5Nm）、后伸（0～1.5Nm）、前屈（0～1.5Nm）分级载荷，分别测量C5/6椎间盘完整组、C5/6椎间盘髓核摘除组和C5/6人工颈椎间盘置换组，C3/4椎间孔高度、宽度和ROV。

The displacement pick-up was put into C3/4 intervertebral space and axis pressure (0～160N) homolateral-bending (0～1.5Nm), oppositeside-bending (0～1.5Nm), back-extending (0～1.5Nm) and anteflexion (0～1.5Nm) were respectively loaded.

将位移传感器置入C3/4椎间孔内，在颈椎标本上施加轴向（0～160N）、同侧弯（0～1.5Nm）、对侧弯（0～1.5Nm）、后伸（0～1.5Nm）、前屈（0～1.5Nm）分级载荷，分别测量C5/6椎间盘完整组、C5/6椎间盘髓核摘除组和C5/6人工颈椎间盘置换组，C3/4椎间孔高度、宽度和ROV。

Objective To investigate distribution rules in preschool children, the main type, degree and axis of astigmatism.

目的 探讨学龄前儿童散光的类型、程度及轴向分布情况。

Results No significant difference was found in axes of astigmatism among the three groups.

结果 术前三组测量方法在散光轴位方面差异无显著性（P＞0.05）。

This paper presents the design and experiment of a high performance three-stage axial fan with forward swept blades.

本文介绍了一台高性能前掠叶型三级轴流风扇的设计与试验研究。

In early phase of embryo development, Shh served as morphogen, and then as axon guidance factor.

修前在胚胎的早期发育时，Shh是形态发生素，而在之后则又是轴突导向因子。

It consists mainly of seat plate, right and left side main magnets, double-layer repelling cavity comprising upper and lower magnets, front and back bending magnets, turntable shaft, turntable, magnetic bars and power output wheel.

它主要是由坐板，右、左侧板式主磁体，双层全排斥腔上、下部磁体及前后面折向磁体，转盘轴，转盘，多根条磁体，动力输出轮等组成。

The pupae were exposed to 9 krad 60Co-γ rays for two days before emergence.The adults were dissected and many mature sperms could be seen in the male flies.There were no significant difference in the form,number and vigor of sperm between irradiatid and unirradiated male flies,but there were some abnormal ultrastructurail changes in the sperm of irradiated male flies such as the appearence of vacuoles in nutrient cells,disarrangement of sperms,variation of the number of chondriosome derivates,axonemes ction of formation and abnormal cell division of sperm cells.

用9krad辐照羽化前2天的蛹，成虫羽化后解剖观察，雄虫已有大量成熟精子，精子形态、数量和活力与未经辐照处理的雄虫无显著差异，但其超微结构则发生了某些异常变化，如营养细胞出现空泡、精子排列零乱、线粒体衍生体和轴丝增多或减少、构型被破坏、精子细胞分裂异常等。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。