单选题How long must the GMDSS radio log be retained on board?（）AAt least two years after the last entryBAt least one year after the last entryCAt least 90 days after the last entryDAt least 30 days after the last entry
单选题
How long must the GMDSS radio log be retained on board?（）
A
At least two years after the last entry
B
At least one year after the last entry
C
At least 90 days after the last entry
D
At least 30 days after the last entry
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