Choose the most suitable one to translate the foll 상세 페이지
1[전파전자통신기사 필기] 05년 1회차
Choose the most suitable one to translate the following sentence into English.
1
You must keep radio silence in this area unless you have message about the casualty.
2
You have not to silence radiocommunication in this area except a message for the casualty.
3
You have to keep radiocommunication silent in this area except in case of a message for the casualty.
4
You may keep radio silence in this area unless you have to messages for the casualty.
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