Non destructive testing of steel tubes. Part 7: automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections.是什么意思_Non destructive testing of steel tubes. Part 7: automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句