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- active nondestructive assay 外加源有损测试
- Nondestructive Assay (NDA) techniques have become powerful tools for quantitative determination of special nuclear materials (SNM), and played an important role in nuclear material control and accounting (MC &A), also in inspection of Nuclear Safeguards. 无损分析(NDA：Nondestructive assay)技术已经成为定量分析特种核材料(SNM：special nuclear materials)的重要工具，它在核材料控制与衡算(MC &A)方面以及在核保障核查工作中起着重要作用。
- Mobile Nondestructive Assay Laboratory 移动式非损伤性测定实验室
- MHLL Mobile Nondestructive Assay Laboratory 移动式非损伤性测定实验室
- Standard Guide for Nondestructive Assay of Special Nuclear Material Holdup Using Gamma-Ray Spectroscopic Methods 使用伽玛射线光谱法进行特定核材料滞留量无损检定指南
- The orient has been playing an active role in the world economy. 亚洲一直在世界经济中发挥积极作用。
- Test Method for Nondestructive Assay of Plutonium in Scrap and Waste by Passive Neutron Coincidence Counting 无源中子复合计数法测定废弃物中钚的无损检验试验方法
- Standard Test Method for Nondestructive Assay of Plutonium, Tritium and 241Am by Calorimetric Assay 用量热弹分析进行钚、氚和镅241无损试验的标准试验方法
- He is an active member of the school's stamp club. 他是学校集邮俱乐部的一名活跃会员。
- An active volcano may explode at any time. 活火山随时都有可能爆发。
- Is it wise to engage in active sports at your age? 我这样的年纪积极参加体育活动是否明智？
- She was active as a left-winger in the party. 她是党内积极的左翼分子。
- Standard Test Method for Nondestructive Assay of Nuclear Material in Scrap and Waste by Passive-Active Neutron Counting Using a 252 Cf Shuffler 使用a252Cf的被动-主动中子计数法在碎片和废料中作核材料无损检定的标准试验方法
- He was very active and rode down several horses. 他劲头很大，一连骑了好几匹马。
- She plays an active part in local politics. 她积极参与地方政治活动。
- The steel market will continue to be active. 钢材市场将会继续保持活跃。
- An active volcano may erupt at any time. 活火山随时可能喷发。
- He was disabled when on active service. 他在战斗中受伤致残。
- Ms. Brown is active in the party. 布朗女士在晚会上很活跃。
- The active boy was extremely distractible. 那好动的男孩极不专心。
