据推算，NGC3115中心的超大质量黑洞，距地球3200万光年，质量相当于太阳质量的20亿倍。这也使它成为距地球最近的“10亿太阳质量级别”黑洞。
The supermassive black hole at the center of NGC 3115, they calculate, has a mass of about 2 billion Suns, making it the nearest billion-solar-mass black hole to Earth at 32 million light-years away.
接近那一点心距，成就那一份健康！
扁管在任何一个截面均为长圆形，其长短轴根据管心距的大小来确定。
Flat tube in any cross section are oblong, the length of the shaft according to the tube pitch to determine the size of.
实验表明，测量系统可快速、精确地测量工件孔心距。
Measurement results and precision analysis indicate that workpiece hole heart distance can be fast and accurately obtained with the method.
图1底下的数值是指网不面的边不幼与两个网不面洋心距的比值。
Figure 1 the above value refers to the dot's sides and two dot pitch ratio.
中远区微差爆破振动叠加效应产生的主要因素是介质的衰减慢。 振动叠加强度与爆源结构特性、爆心距和间隔时间有关。
The intensity of vibration superposition is affected by the characteristics of explosion source , millisecond delay interval and distance between explosion source and measuring point.
本文主要论述大型洞库爆炸试验中，现场测试得到的距爆心不同距离上地震波的特点，地震图的正确解释以及波形在频域内的特性。
In this paper, characteristics of seismic waves in different distances from center of explosion are obtained in situ measurement in the experiment of large-scaled chamber's store.
对多轴膝关节进行了分析，提出了承重稳定裕度角、全伸展位绝对瞬心距和相对瞬心距的概念，用于评价下肢假肢的稳定性和相对稳定性。
Based on analyzing the knee joints of the four bar linkage, this paper presents the concepts of the stable well off angle, absolute and relative instantaneous distance.
讨论远心投影物镜像差和CCD节距的关系，给出远心投影物镜校正像差的依据。
The relation between aberrations of the telecentric projection objective and the pitch CCD is discussed. The criterion of correcting aberrations in the telecentric projection objective is also given.
基于解析几何法导出的最大压力角表达式，导出了偏心凸轮机构和对心凸轮机构的基圆半径和偏距的计算公式。
According to the allowed pressure Angle, this paper determines the disk CAM with translating followers basic circle radius and eccentricity by using the analytic method.
通过分析车轮转动时轮心相对于主销轴线的运动，推导出主销横向偏移距及主销纵向偏移距的算法；
Through the analysis of the rotation of the wheel center round the kingpin axis, derive spindle offset and longitudinal kingpin offset algorithm;
通过分析车轮转动时轮心相对于主销轴线的运动，推导出主销横向偏移距及主销纵向偏移距的算法；
Through the analysis of the rotation of the wheel center round the kingpin axis, derive spindle offset and longitudinal kingpin offset algorithm;
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