Which radiotelephone signal indicates receipt of a distress message?（）

A.A continuous sounding with any fog signal apparatus
B.A signal sent by radiotelephone consisting of the spoken word Mayday
C.An International Code Signal of N.C
D.The firing of green star rockets or shells

A.a distinctive signal
B.the Morse Code signal for SOS
C.a computerized voice announcement of Mayday
D.your vessel's International Radio Call Sign

A.Control bleeding
B.Reduce pain
C.Immobilize a fracture
D.Reset the bone