When you are firing a pyrotechnic distress signal，it should be aimed（）.

单项选择题When two vessels are in immediate danger of collision，the stand-on vessel must（）.

A.abandon ship
B.assist in taking whatever action is necessary to avoid collision
C.hold course and speed
D.sound a distress signal

单项选择题What is NOT a distress signal?（）

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

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

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

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