... 推力环 thrust collar 验证试验 type certification testing 浮重 wet weight ...
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Type Testing And Certification 型式试验和认证
type certification testing
型式认证试验
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Now about 1, 000 strong, and less than two years old, it is finishing beta testing on its Level 1 certification program as I type.
CNN: Community efforts in Linux certification
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