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Except as provided for otherwise，an oil tanker might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.
A:the tanker is within 50 nautical miles from the nearest land
B:the tanker is no more than 50 nautical miles from the nearest land
C:the tanker is more than 50 nautical miles from the nearest land
D:the tanker is not more than 50 nautical miles from the nearest land

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出自：海船船员证

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