On condition that post porcelain insulators satisfy quality standard, Ultrasonic crackdetection can effectively obviate the accident of post porcelain insulators crack.
在产品质量合格的前提下，超声探伤检测的准确率比较高，能够有效地避免断裂事故的发生。
2
However, the crackdetection rate and reliability of these methods need further study.
但是，这些方法的裂纹检出率和可靠性需要深入研究。
3
Location is one of the key problems in pavement crackdetection and recognition system.