A.vessel being towed
B.fishing vessel engaged in trawling
C.vessel at anchor warning you of her location
D.power-driven pilot vessel on station underway
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A.falls
B.rises
C.is steady
D.is unreliable
A.true directions
B.compass error
C.deviation
D.magnetic directions
A.the designed area
B.the designated area
C.the indicated area
D.all area over the world
A.Notices to Mariners
B.Sailing Directions
C.List of Lights and Signals
D.Guide to Port Entries
A.GL WNG
B.GEN SYN
C.STM WNG
D.TY WNG
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Steam smoke will occur when（）.
On notification by Admiralty Notice to Mariners that a new edition of one of the books，or a new supplement to one，has been published，it should be obtained（）.
Periodic publications notifying changes in，or additions to，previously published navigational data are（）.
LOW ABOUT 300 MILES SOUTHWEST OF LISBON 1004 MOVING SLWLY SOUTHEAST COMMA FILLING 1006 BY MIDNIGHT.This phrase is likely to be under the heading of（）.
Many navigational warnings are of a temporary nature，but others remain in force for several months or may be succeeded by（）.
The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
（）is the system for the broadcast and automatic reception of maritime safety information by means of narrow-band direct-printing telegraphy.
The height of a tide can be increased by（）.
In revised editions of Admiralty charts the（）are corrected first．
Section V of the ADMIRALTY NOTICES TO MARINERS is（）.