Using Ultrasonic Velocity Method to Check and Measure the Vermicular Graphite Quality in the Diesel Engine Cylinder Head Made of Vermicular Graphite Cast Iron是什么意思_Using Ultrasonic Velocity Method to Check and Measure the Vermicular Graphite Quality in the Diesel Engine Cylinder Head Made of Vermicular Graphite Cast Iron在线翻译_英语_读音_用法_例句