Ultrasonic examinations

• 超声

Ultrasonic examinations的用法和样例：

例句

1. Studies on Ultrasonic Extraction Process in Pteris semipinnata L.
   半边旗药材超声提取工艺的研究。
2. For ductile iron, is ultrasonic testing done for nodularity?
   对于球铁，有超声测试吗？