本文提出了应用射电干涉测量的方法测七地球自转的三个参数时，源矢量的最佳分布条件。
An optimum distribution condition of radio sources for the determination of Earth rotation parameters by means of VLBI technique was proposed and explained in detail.
利用这一比值，可以由参考样品的性能参数方便地求出待测样品的相关性能参数。
The ratio of the two specimens photoacoustic signals is the devices output, And it can be used to study the property of the test specimen .
机加工表面的多重尺度特征导致在一定分辨率测量条件下所测得的统计参数不能客观地反映被测表面的特征。
Because of their multi scale characteristic, it's impossible to characterize machined surfaces objectively with statistic parameters measured by a measuring instrument of limited resolution.
应用推荐