（） 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.<br>A:Security level 1<br>B:Security level 2<br>C:Security level 3<br>D:Medium safe level

（） 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

出自：海船船员证

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