单项选择题
The shoreline on charts generally represents the mean（）.
A.High water line B.Low water line C.Low water spring line D.Tide level
单项选择题 The broken magenta lines（long and short dashes）in and around Mobjack Bay indicate（）.
单项选择题 The arrangement of charts in the catalogue is（）.
单项选择题 That the scale of any part of a chart to be larger than the scale of the survey is（）.
