... （转载） ... 空间平均速度 space mean speed 推荐速度 advisory speed 自由流车速 free flow speed ...
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advisory speed sign 推车速标志
Green Light Optimal Speed Advisory 绿灯最佳车速顾问
After returning and graduating from Purdue, Neil applied to become a test pilot at the National Advisory Committee for Aeronautics High-Speed Flight Station at Edwards Air Force Base.
FORBES: Neil Armstrong's Immortal Footprint
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