单项选择题
A.mark the position of a lost mooring B.determine your vessel's sideslip underway C.determine your speed through the water D.indicate location of a man overboard
（）objects are those which stand out clearly from the ba...
单项选择题（）objects are those which stand out clearly from the background or other objects and are easily identifiable from a few miles offshore in normal visibility．
A.Conspicuous B.Permanent C.Preliminary D.Temporary
（）day，pilot flag should be displayed from main mast．A.F...
单项选择题（）day，pilot flag should be displayed from main mast．
A.From B.By C.on D.With
The heights and soundings of Admiralty chart are expres...
单项选择题The heights and soundings of Admiralty chart are expressed（）in Fathoms（）in Meters．
A.either，or B.neither，nor C.another，nor D.other，or
