正确答案: B

2人

题目：组织艇筏内全体人员24小时轮流值班，当人数足够时，应采取每更：

解析：B

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举一反三的答案和解析：

[单选题]If anything abnormal be found on the load change of main engine when the ship is entering in shallow waterway, before taking measures the engineer on duty should _______.

inquire the bridge for the situation initiatively

[单选题]The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the ____.

Institute number viscosity index number