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单选题
What is meant by the term “radio silence”?（）
A
Stations not directly involved with the on-going distress communications may not transmit on the distress frequency or channel
B
Stations remaining off the air to safeguard proprietary information
C
Two three-minute silent periods，at 15 and 45 minutes after the hour，that provide a transmitting window for distressed vessels to transmit distress alerts using J3E
D
Communications on a distress frequency or channel is banned for 24 hours following the cessation of the distress traffic
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单选题What is the fundamental purpose for imposing radio silence? （）A
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单选题What is meant by spotting the boom?（）A
Lowering it into a cradleB
Placing it in a desired positionC
Spotting it with wash primer and red leadD
Two-blocking it
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