A message warning of a tropical storm should be sent as a(n)（）.

单项选择题A crew member has just fallen overboard off your port side. Which action should you take?（）.

A.Immediately put the rudder over hard right
B.Immediately put the rudder over hard left
C.Immediately put the engines astern
D.Wait until the stern is well clear of the man and then put the rudder over hard right

单项选择题（）of the following messages is allowed to be transmitted on the radiotelephone without the authority of the Master.

A.Urgency signal
B.Safety signal
C.Distress signal
D.None of the above

单项选择题MV SUDAN MEAN AT 0200UTC IN POSITION 40.44N 141.52E PASSED A DERELICT ABOUT 40 TONS HALF SUBMERGED AND IS DRIFTING. This cable says that she met with possibly（）.

A.a floating wreck
B.a survivor at sea
C.a man who had fallen overboard
D.a drilling rig

单项选择题You hear on the radiotelephone the word SECURITE spoken three times. This indicates that（）.

A.a message about the safety of navigation will follow
B.a message of an urgent nature about the safety of a ship will follow
C.the sender is in distress and requests immediate assistance
D.you should secure your radiotelephone

单项选择题You see an iceberg that has not been reported. What kind of radio message do you transmit to warn others?（）.

A.Safety message
B.Urgency message
C.Distress message
D.Routine message