distress signal
短语词组
- parachute distress rocket signal 降落伞遇险火箭信号;跳伞火箭求救信号
- red star distress rocket signal 红星遇险火箭信号
- pyrotechnical distress signal 烟火遇险信号
- misuse of distress signal 误用遇险信号
- smoke distress signal 烟雾呼救信号
- plant distress signal 植物求救信号
- personal distress signal unit 佩带者不适信号装置
- automatic distress signal 自动遇险信号
- distress signal rocket [水运]遇险信号火箭 返回 distress signal