The rocket shall, when fired vertically, reach an altitude of not less than 300 m. At or near the top of its trajectory, the rocket shall eject a parachute flares which shall: ______
发布于 2021-03-04 21:04:07
【多选题】 A burn with a bright orange colour. B burn uniformly with an average luminous intensity of not less than 30,000 cd. C have a burning period of not less than 45 s. D have a rate of descent of not more than 5 m/s.
