reference test block meaning in English

标准块
标准试样

Non - destructive testing - penetrant testing reference test blocks
无损检测渗透检验标准试块
Non - destructive testing - penetrant testing - reference test blocks
无损检验.渗透检验.标准试样
Non - destructive testing - penetrant testing - part 3 : reference test blocks
无损检验.渗透试验.第3部分:标准试验块
Non - destructive testing - penetrant testing - part 3 : reference test blocks
无损检验.渗透性检验.第3部分:标准测试块
Non - destructive testing - penetrant testing - part 3 : reference test blocks iso 3452 - 3 : 1998 ; german version en iso 3452 - 3 : 1998
无损检验.渗透检验.第3部分:标准试样块