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单选题
（）is the most visible signal of distress from a lifeboat at sea in the daytime.
A
Smoke signal
B
Flash signal
C
Fire signal
D
Radio emergency transmission
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general radio communicationB
MSIC
improved distress and safety communicationD
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单选题Which signal is detected as originating from a SART?（）A
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单选题What would NOT be a distress signal?（）A
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单选题Which signal is recognized as a distress signal?（）.A
Directing the beam of a searchlight at another vesselB
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COSPAS-SARSATB
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COSPAS-SARSATB
ground receiving stationsC
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Near polar orbiting satellites
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单选题What is NOT a distress signal?（）A
A continuous sounding of the fog hornB
Firing a gun every minuteC
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A square flag and ball flown from the mast
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COSPAS-SARSATB
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spacecraftD
satellite SAR instrument
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