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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶电气与船舶安全

单项选择题

（） means the level for which appropriate additional protective security measures shall be maintained for a period of time as a result of heightened risk of a security incident.

A.Security level 1
B.Security level 2
C.Security level 3
D.Medium safe level

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