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单选题
When your vessel enters thick fog，she should sound（）every two minutes in accordance with these Rules.
A
one short blast
B
one prolonged blast
C
two short blasts
D
three short blasts
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考题
单选题When vessel enters thick fog, she should sound（）every two minutes in accordance with the rules.A
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keep the radar on the shortest available range for early detection of approaching vessels
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