问题
单项选择题
When vessel enters thick fog, she should sound（）every two minutes in accordance with the rules.
A.one short blast
B.one prolonged blast
C.two short blasts
答案
参考答案：B
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When vessel enters thick fog, she should sound（）every two minutes in accordance with the rules.
A.one short blast
B.one prolonged blast
C.two short blasts
参考答案：B