Plumbing Craft Certificate 水喉工艺证书
High Speed Craft Safety Certificate 安全证明书
craft certificate
工艺证书
以上为机器翻译结果,长、整句建议使用 人工翻译 。
He said operators of planes must get a certificate of authorization from the FAA, and the craft are to be flown under 400 feet and primarily in daytime hours.
CNN: Drone use in U.S. may require new laws, Senate panel told
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