The initial crack size was assumed through the visual inspection and the ultrasonic detection method.
2
根据超声波探测理论,讨论了多脉冲循环法用作非接触式流量检测的原理。
According to the theory of ultrasonic inspection, the principle of flow inspection using multi pulse circulation method was discussed.
3
在医疗部分有两个主要问题:首先尽管超声波探测大脑是可能的,但是超声波无法穿透头骨。
There are two main problems with the medical care presented. First, while it is possible to ultrasound the brain, ultrasound waves cannot penetrate the skull.