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单选题
What is NOT a distress signal?（）
A
Red flares or red rockets
B
Continuous sounding of fog signaling apparatus
C
International Code Flags November and Charlie
D
Basket hanging in the rigging
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单选题Which is NOT a distress signal? （）A
A continuous sounding with any fog signal apparatusB
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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
MAYDAY sent by radiotelephoneB
Continuous sounding of fog hornC
Green star shells fired from a launcherD
Square flag and ball in a vertical line
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International Code Signal PAN spoken over the radiotelephone
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SOS three timesB
Additional transmissions to aid direction findingC
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Two tones，10-15 seconds each
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An International Code Signal of N.CD
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Roger wilcoB
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COSPAS-SARSATB
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Firing a gun every minuteC
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