单选题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（）.AtemporaryBpermanentCoccasionalDsteady
单选题
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
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