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
N(名词) a signal by radio, Very light, etc from a ship or other vessel in need of immediate assistance 求救信号