A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.an area of a channel where passing another vessel is permitted
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A.heavy rain within six hours
B.a decrease in wind velocity
C.a change in the present weather conditions
D.that fog will soon set in
A.Straight line
B.Arc
C.Parabola
D.Hyperbola
A.large GM
B.high center of gravity
C.excessive free surface
D.small GZ
A.In the lower level of the pumproom
B.In the middle level of the pumproom
C.In the upper level of the pumproom
D.On the deck outside the pumproom
A.atmospheric pressure
B.wind speed
C.relative humidity and dew point
D.wind chill factor
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Mariners not entering the port are（）to keep at least one mile off.
Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.
Many of the lights on this coast are placed so high as to be frequently obscured by（）.
The program of graphical predictions of height against time for a period of up to seven consecutive days is contained in（）.
A vessel in distress should send by radio telephone the two tone alarm signal followed immediately by the（）.
Light Lists for coastal waters are（）.
After the boat is at the top of the davit heads，the davit arms begin moving up the tracks and are stopped by the（）.
On an Atlantic Ocean voyage from New York to Durban，South Africa，you should expect the Agulhas Current to present a strong（）.
The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.
When an azimuth of the Sun has been taken and the deviation of the standard magnetic compass computed，the watch officer should record the results（）.