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．
A.Mercator charts／Loran charts B.Admiralty charts／Routeing charts C.large scale charts／small scale charts D.small scale charts／large scale charts
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)（）.
单项选择题 Charted depths are decreased（）2 meters．
