2级和3级操作人员，持有美国无损检测协会（ASNT）资格证，并且具有无损探伤作业的相关经验。
Evidence that Level 3 and Level 2 operatives hold appropriate ASNT qualifications and have relevant experience in NDE activities.
2级和3级操作人员，持有美国无损检测协会（ASNT）资格证，并且具有无损探伤作业的相关经验。
Evidence that Level 3 and Level 2 operatives hold appropriate ASNT qualifications and have relevant experience in NDE activities.
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