单项选择题
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（）.
A.GALE WARNING B.24 HOURS FORECAST C.GENERAL SITUATION D.TROPICAL CYCLONE WARNING
单项选择题 Information for updating nautical charts is primarily found in the（）.
单项选择题 In revised editions of Admiralty charts the（）are corrected first．
单项选择题 Generally，（）are used as the track charts on the high sea，（）are used for harbors，inland waters and coastal areas．
