Areas which cannot be scanned by the radar of the vessel because they are shielded by parts of its superstructure, masts,etc means（）.<br>A:blind sectors<br>B:sheltered area<br>C:unseen area<br>D:unscan ble area

Areas which cannot be scanned by the radar of the vessel because they are shielded by parts of its superstructure, masts,etc means（）.
A:blind sectors
B:sheltered area
C:unseen area
D:unscan ble area

出自：海船船员证

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