A.a green star signal
B.orange-colored smoke
C.red flares
D.the repeated raising and lowering of outstretched arms
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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
A.MAYDAY sent by radiotelephone
B.Continuous sounding of fog horn
C.Green star shells fired from a launcher
D.Square flag and ball in a vertical line
A.abandon ship
B.assist in taking whatever action is necessary to avoid collision
C.hold course and speed
D.sound a distress signal
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At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.
The service life of distress signals must be not more than（）.
Distress signals may be（）.
ALL PASSENGERS OF DECK NO.2 ARE REQUESTED TO FOLLOW THE CREW MEMBERS WHO WILL ESCORT YOU TO YOUR ASSEMBLY STATIONS. From this sentence you can concluded that the vessel is in（）.
An airplane wants a vessel to change course and proceed towards a vessel in distress. The actions of the aircraft to convey this message will NOT include（）.
The radiotelegraph alarm signal may be used to announce（）.
The color of rockets，shells，or rocket parachute flares used to indicate that the vessel is in distress and requires immediate assistance is（）.
After launching，an inflatable raft should be kept dry inside by（）.
When you are firing a pyrotechnic distress signal，it should be aimed（）.
If you are transmitting a distress message by radiotelephone you should（）.