单选题Except as provided for otherwise，an oil tanker might discharge certain amount at certain rate of oil or oily mixtures into sea when（）.Athe tanker is within 50 nautical miles from the nearest landBthe tanker is no more than 50 nautical miles from the nearest landCthe tanker is more than 50 nautical miles from the nearest landDthe tanker is not more than 50 nautical miles from the nearest land
单选题
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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