单项选择题
Which is NOT a distress signal?（）
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
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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 -
单项选择题
What is the normal length of anchor cable used to anchor a vessel?（）
A.An amount equal to the depth of the water
B.Two times the depth of water
C.Three to four times the depth of water
D.Five to seven times the depth of water
