A.falls
B.rises
C.is steady
D.is unreliable
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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
A.GALE WARNING
B.24 HOURS FORECAST
C.GENERAL SITUATION
D.TROPICAL CYCLONE WARNING
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Information for updating nautical charts is primarily found in the（）.
Generally，（）are used as the track charts on the high sea，（）are used for harbors，inland waters and coastal areas．
Steam smoke will occur when（）.
The best estimate of the wind direction at sea level can be obtained from observing the direction of the（）.
Weekly NMs are available without subscription from appointed（）.
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（）.
Section V of the ADMIRALTY NOTICES TO MARINERS is（）.
Why is a warning sign displayed at the gangway or access point of a barge during cargo transfer（）.
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（）.
On the approach of a warm front the barometric pressure usually（）.