However, ultrasonic checks showed cracks in the seams. 但是超声波检查,表明焊缝还有裂纹。
Ultrasound examination for oligohydramnios is useful to confirm the diagnosis but oligohydramnios may be caused by other disorders besides PROM. 超声检查提示羊水过少也可以证实胎膜早破的诊断,但除胎膜早破外其它因素也可以致羊水过少。
It is also desirable to have a reasonably fine grain in order to obtain ultrasonic inspectability. 为了获得良好的超声波探伤性能,也希望得到合适的细晶粒。
This paper deduces the errors sources from the process of ultrasonic longitudinal wave testing and evaluates its uncertainty. 本文分析了超声波探伤纵波检测的误差来源,评定了在探伤过程中的不确定度。