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jin ji qiu jiu xin hao
Pages: 99-99
Year: Issue:  7
Journal: HONGLINGJIN,A

Keyword:  信号野外探险紧急救援;
Abstract: 当乘车、乘船、野外探险遇到无法预料的灾难时,就需要接受外界的紧急救援。向他人发出信号、引起别人的注意是十分重要的求救方法,下面给大家介绍几种常见的求救信号:
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