测试位置 meaning in English

t test position
testing position

That specifies the location to test
指定测试位置的
Returns a null reference nothing in visual basic if no object is at the tested location
如果测试位置没有对象，则返回空引用（在visual basic中为nothing ）。
Based on that penetration depth of eddy current is theoretically different for different operationalfrequency , the flaw depth quantitive measurement method based on the characteristicalfrequency was expounded . to find the best testing model and position , it analysed and discussedthe factors which effected measurement . the mathematic relationship between the specialfrequencyand flaw depth was established to realize the accureate measurement of flaw depth . it primarily researched the technology of alternating current magnetic field leakage testing ( ac - mfl ) in our country
在利用频率扫描技术的基础上,提出了基于拐点频率的涡流检测缺陷深度测量方法,对影响测量的多种因素进行了分析和实验研究,得到了最佳的测试位置和测试方法,建立了拐点频率和缺陷深度的定量关系,为深度的测量提供了新的途径。