The issue of Notices to Mariners of charts and these aids(Radar beacons)may be delayed until such time as they are assessed to be（）.<br>A:temporary<br>B:permanent<br>C:occasional<br>D:steady

The issue of Notices to Mariners of charts and these aids(Radar beacons)may be delayed until such time as they are assessed to be（）.
A:temporary
B:permanent
C:occasional
D:steady

出自：海船船员证

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