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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An inflatable liferaft should be manually released from its cradle by（）.
Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.
The international number，location and/or name，geographical co-ordinates，characteristics and intensity，elevation in metres，range in sea miles and description of structure of a light can be found in（）.
The latest known details of lights are given 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（）.
An inflatable liferaft is hand-launched by（）.
The Coast Radio Stations are found in（）.
The daily predictions of the times and heights of high and low water for a selection of Standard Ports are given in（）.
The Lists of Meteorological Observation Stations can be found in（）.