单选题Sailing directions are kept up to date by （）.A publicationsB notices to marinersC supplementsD Annual Summary of Admiralty Notices to Mariners

A. Network diagram

B. Performance baseline

C. Network security procedure

D. Company policy

Admiralty Sailing Directions are Kept up to date by________.

A.corrections

B.publications

C.supplements

D.alterations

31_______

A. kept up with

B. caught up with

C. came up with

D. put up with

Admiralty Sailing Directions are written with the assumption that the reader ______．

A.is familiar with all information contained in UKHO publications

B.knows nothing about any sailing directions

C.is lack of particular knowledge concerning the navigation of the area

D.has the appropriate chart before him and other relevant publications to hand

The Sailing Directions contain information on ______.

A.required navigation lights

B.lifesaving equipment standards

C.casualty reporting procedures

D.currents in various locations

“把查询sc表和更新sc表的grade列的权限受予用户userl”的正确SQL语句是（ ）。

A）GRANT SELECT，UP DATE(grade)ON TABLE sc TO userl

B）GRANT SELECT sc，UP DATE sc，grade TO userl

C）GRANT SELECT，UP DATE ON TABLE sc，grade TO userl

D）GRANT SELECT ON ABLE sc，UP DATE ON TABLE sc(grade) TO userl

Place names used on board ships should be those ______.

A.specified by international authorities

B.specified by national authorities

C.on standard map

D.on the chart or Sailing Directions in use

Sailing directions are kept up to date by ______.

A.publicatons

B.notices to mariners

C.supplements

D.Annual Summary of Adiralty Notices to Mariners

Which is a weekly publication advising mariners of important matters affecting navigational safety?

A.Light List

B.Notice to Mariners

C.Coast Pilot

D.Sailing Directions

Admiralty Sailing Directions published in England are kept up to date by______．

A.corrections

B.publications

C.supplements

D.Alterations