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逆计数
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逆计数
nì jì shù
由大到小倒着数的时间计数方法。发射宇宙飞行器时,为引起发射人员高度注意,一般从发射前一小时起,指挥部以分为单位报时;从发射前五分钟起,以秒为单位报时。可随时告诉人们离运载火箭点火时刻的时间间隔。逆计数法在其他场合也被采用。
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更新时间:2026/7/1 0:20:31