单选题
You are Master of a towing vessel engaged in towing three barges astern.The middle barge of the tow would be required to sound which of the following during restricted visibility （）.
发布日期：2021-03-22
No fog signal
A prolonged blast at intervals never to exceed more than two minutes
A prolonged blast followed by two short blasts at intervals never to exceed more than two minutes
A prolonged blast followed by three short blasts at intervals never to exceed more than one minute
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关于包扎的叙述，正确的是
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