单项选择题

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

A.Roger wilco
B.Romeo，romeo，romeo
C.SOS acknowledged
D.Mayday roger

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单项选择题

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

单项选择题

When testing a Class A EPIRB you will know the EPIRB is working properly if you hear on 99.5 Mhz FM or any vacant frequency on a nearby AM radio（）.

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

单项选择题

What is the primary purpose of a splint applied in first aid?（）

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