Models of t type rubber sealing ring matching with nodular graphite cast iron 与球墨铸铁管配套的t型橡胶密封圈规格：
2.
It is introduced the basic principles and application status of diversified nondestructive test technology techniques used in the quality testing of nodular graphite cast iron 摘要介绍了无损检测技术用于球墨铸铁质量检测的基本原理及应用状况。
