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在技术飞速发展的时代，技术更新速度大大加快了，造成任何一项新技术的生命周期相应缩短。原先看来在同行业中遥遥领先的一项技术......

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A． They would help the crew to get out of the desert.B． They would help the crew to have radio contact.C． They would help people to identify them.D． They would help the engineers to know what had befallen them.
A． They would help the crew to get out of the desert.
B． They would help the crew to have radio contact.
C． They would help people to identify them.
D． They would help the engineers to know what had befallen them.
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