If you are transmitting a distress message by radiotelephone you should（）.

单项选择题A person who sees someone fall overboard should（）.

A.call for help and keep the individual in sight
B.run to the radio room to send an emergency message
C.immediately jump in the water to assist the individual
D.go to the bridge to report the captain

单项选择题（）is the most visible signal of distress from a lifeboat at sea in the daytime.

A.Smoke signal
B.Flash signal
C.Fire signal
D.Radio emergency transmission

单项选择题Which signal is recognized as a distress signal?（）.

A.Directing the beam of a searchlight at another vessel
B.A smoke signal giving off orange colored smoke
C.A whistle signal of one prolonged and three short blasts
D.International Code Signal PAN spoken over the radiotelephone

单项选择题A RADIO SIGNAL FROM A DISTRESSED VESSEL AUTOMATICALLY DIRECTED TO A RCC GIVING POSITION，IDENTIFICATION，COURSE AND SPEED OF THE VESSEL AS WELL AS THE NATURE OF DISTRESS is known as（）.

A.Distress alert
B.Safety alert
C.Emergency alert
D.General alert

单项选择题You receive a call from the MSA OF CHINA addressed to all stations. The call begins with the words Pan-Pan (3 times). Which type of emergency signal would this be?（）.

A.Safety signal
B.Urgency signal
C.Distress signal
D.Red alert signal