Navigational charts are subject to frequent changes，the important ones of which are promulgated by （）.<br>A:Admiralty Notices to Mariners<br>B:Mariner's Handbook<br>C:Catalogue<br>D:Sailing Directions

Navigational charts are subject to frequent changes，the important ones of which are promulgated by （）.
A:Admiralty Notices to Mariners
B:Mariner's Handbook
C:Catalogue
D:Sailing Directions

出自：海船船员证

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