单项选择题

Sailing directions are kept up to date by （）.

A.publications
B.notices to mariners
C.supplements
D.Annual Summary of Admiralty Notices to Mariners

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单项选择题

A.specified by international authorities
B.specified by national authorities
C.on standard map
D.on the chart or Sailing Directions in use

单项选择题

A.assumed
B.appreciated
C.promised
D.permitted