We use this air horn to give a signal in the event of emergency.
应急情况下，用这个气喇叭发信号。
All entrants may transmit only one signal on the air at any given time.
所有参赛电台在同一时间只能发送一个信号。
Objective To design an air inlet valve for signal soldier ligebuoy.
目的设计一种单兵救生气囊充气阀。
Air distress signal or interfering signal?
飞机遇险呼救还是干扰信号?。
Air distress signal or interfering signal?
飞机遇险呼救还是干扰信号?。
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