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单选题
What is the fundamental purpose for imposing radio silence? （）
A
To ensure that interference to proprietary communications is minimized
B
To ensure that only voice communications can be effected on the distress frequency or channel
C
To ensure that a distressed vessel will have a window twice each hour for transmitting routine messages
D
To ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized
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考题
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