单项选择题

Every new supplement to the Sailing Directions （） the previous one．

A.enforces
B.cancels
C.corrects
D.replenishes

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单项选择题

A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal

单项选择题

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

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