危险作业监护人应始终在作业现场监督作业安全，短时间离开时，作业负责人不必另行指定监护人，履行变更手续，并告知全体被监护人员。
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CP341/CP441-2需要多少许可证（License）？
When preparing a ship for heavy weather，fuel oil day tanks should be（）.
A. pumped overboard to calm the seas
B. drained to the lower hull to reduce free surfaces
C. filled to ensure that sufficient fuel oil is available during a lengthy emergency
D. partially drained to increase free surfaces in order to reduce motio
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