certificate of necessity
英 [səˈtɪfɪkət ɒv nəˈsesəti]
美 [sərˈtɪfɪkət əv nəˈsesəti]
需要证明（书）
双语例句
- Data Interchange for Shipping Companies certificate of public convenience and necessity
航运公司数据交换系统公共交通运输业许可证 - Swift expansion of communications and transportation. certificate of public convenience and necessity
公共交通运输业许可证 - Concering to the current structure and equipment of ship in guide series for mariner obtaining certificate test, this paper analyses relevant questions on the practice of test for marine officer in China, and points out the improving necessity and offers some advices.
针对海船船员适任统考指南《船舶结构与设备》的现状，分析了其在应用于船员统考实践中存在的相关问题，并提出了改进的必要性与若干建议。