A.SOS sent three times
B.ten one-second dashes with a four-second interval between them
C.twelve four-second dashes with a one-second interval between them
D.twelve one-second dashes with a short interval between them
您可能感興趣的試卷
你可能感興趣的試題
A.1.5 and greater
B.1.25 and greater
C.1.0 and greater
D.0.5 and greater
A.hold anchor
B.leave anchor
C.let go anchor
D.weigh anchor
A.reduce the length of the cable
B.pay out more anchor cable
C.back the engines
D.swing the rudder several times to work the anchor into the bottom
A.Distress
B.Safety
C.All clear
D.Urgency
A.a ship is threatened by grave and imminent danger and requests immediate assistance
B.a calling station has an urgent message about the safety of a person
C.the message following the prefix will be about the safety of navigation
D.the message following is a meteorological warning
最新試題
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（）.
Fog forms when the air（）.
To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.
The term OIL as used in the Oil Pollution Regulations means（）.
Tripping defects in anchors frequently occur in（）.
The use of the danger signal（）.
There is plenty of（）at this area.
PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow?（）
What is the normal length of anchor cable used to anchor a vessel?（）
The radiotelegraph alarm signal is（）.