单选题How is “radio silence” imposed?（）ABy the On Scene Coordinator (OSC)BBy the Coast Earth Station (CES) controlling the distress communications on that frequencyCIt is imposed by the Public Correspondence Station (PCS) controlling the distress communications on that frequency or channelDIt is imposed by the High Seas Service (HSS) controlling the distress communications on that frequency or channel
单选题
How is “radio silence” imposed?（）
A
By the On Scene Coordinator (OSC)
B
By the Coast Earth Station (CES) controlling the distress communications on that frequency
C
It is imposed by the Public Correspondence Station (PCS) controlling the distress communications on that frequency or channel
D
It is imposed by the High Seas Service (HSS) controlling the distress communications on that frequency or channel
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