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单选题
A distress signal（）.
A
consists of 5 or more short blasts of the fog signal apparatus
B
consists of the raising and lowering of a large white flag
C
may be used individually or in conjunction with other distress signals
D
is used to indicate doubt about another vessel's intentions
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单选题Which is NOT a distress signal? （）A
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单选题A distress signal（）.A
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单选题Which is a distress signal? （）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
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单选题Which radiotelephone signal indicates receipt of a distress message?（）A
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SOS acknowledgedD
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考题
单选题（）process the distress signal from EPIRB to determine its position and identity.A
COSPAS-SARSATB
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towing a submerged objectC
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单选题For COAPAS-SARSAT system,（）process the distress signal from EPIRB to determine its position and identity.A
COSPAS-SARSATB
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spacecraftD
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