By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.<br>A:six months<br>B:one year<br>C:two years<br>D:thirty months

By regulation，you MUST keep a record of the use of your radiotelephone for a minimum of（）.
A:six months
B:one year
C:two years
D:thirty months

出自：海船船员证

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