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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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出自：海船船员证

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