Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.<br>A:Notices to Mariners<br>B:Sailing Directions<br>C:List of Lights and Signals<br>D:Guide to Port Entries

Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.
A:Notices to Mariners
B:Sailing Directions
C:List of Lights and Signals
D:Guide to Port Entries

出自：海船船员证

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