helicon wave是什么意思

用法例句

Helical fissures are observed on the surface of steel Cr12MoV cold work rolls after rough grinling by use of magnaflux inspection and metallographic examination.

采用磁粉探伤、化学分析及金相检验等方法对Cr12MoV钢冷轧工作辊粗磨后表面呈现的螺旋形波纹进行了检测分析。