单项选择题
In revised editions of Admiralty charts the（）are corrected first．
A.smaller scales B.larger scales C.smaller scales and larger scales D.moderate scales
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．
单项选择题 For what purpose would using a Lambert conformal chart be more convenient than using a Mercator?（）
单项选择题 Fog is most commonly associated with a(n)（）.
