单项选择题
A.Red flares or red rockets B.Continuous sounding of fog signaling apparatus C.International Code Flags November and Charlie D.Basket hanging in the rigging
What is NOT a distress signal?（）A.A continuous sounding...
单项选择题What is NOT a distress signal?（）
A.A continuous sounding of the fog horn B.Firing a gun every minute C.Five or more short rapid blasts on the whistle D.A square flag and ball flown from the mast
The service life of distress signals must be not more t...
单项选择题The service life of distress signals must be not more than（）.
A.forty two months from the date of manufacture B.thirty six months from the date of the last inspection C.twenty four months from the date of approval D.twelve months from the date of purchase
The radiotelegraph alarm signal may be used to announce...
单项选择题The radiotelegraph alarm signal may be used to announce（）.
A.that a distress message will follow B.a request for assistance in searching for a man overboard C.an urgent warning about a cyclone D.All of the above
