航海英语航海图书资料单项选择题每日一练(2018.11.19)

单项选择题
A man aboard a vessel，signaling by raising and lowering his outstretched arms to each side，is indicating（）.
A.danger，stay away
B.all is clear，it is safe to pass
C.all is clear，it is safe to approach
D.a distress signal
单项选择题
The distance between the surface of the water and the tidal datum is the （）.
A.range of tide
B.height of tide
C.charted depth
D.actual water depth
单项选择题
You will find information about the duration of slack water in the （）.
A.Tidal Current Tables
B.Tide Tables
C.American Practical Navigator
D.Sailing Directions
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
单项选择题
The Daily Memorandum contains information on（）.
A.active weather disturbances such as hurricanes or tropical storms
B.the latest navigational warnings
C.scheduled vessel arrivals and departures for a 24-hour period
D.water levels at river ports where run-off affects tidal heights