摘要
环缝透照,必须计算有效评定长度。
When the circular seams are transilluminated the effective assess length must be calculated, so that the film length can be determined accurately.
出处
《石油知识》
2007年第4期35-35,共1页
Petroleum Knowledge
关键词
胶片长度
有效评定长度
Film length effective assess length