单项选择题
A.NM B.Ship's Routing C.Colreg D.Solas
The time required for a lighted aid to complete a full ...
单项选择题The time required for a lighted aid to complete a full cycle of light changes is listed in the Light List as the().
A.Set B.Frequency C.Period D.Function
The recording fathometer produces a graphic record of t...
单项选择题The recording fathometer produces a graphic record of the().
A.bottom contour only up to depths of 100 fathoms B.depth underneath the keel against a time base C.contour of the bottom against a distance base D.depth of water against a distance base
The points on the earth’s surface where the magnetic di...
单项选择题The points on the earth’s surface where the magnetic dip is 90° are().
A.Along the magnetic equator B.Connected by the isoclinal line C.The isopors D.The magnetic poles