单项选择题

In which source could you find the number of a chart for a certain geographic area?（）

A.Chart No.1
B.Catalog of Charts
C.IMO Practical Navigator
D.IMO Light List

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单项选择题

A.points of equal variation
B.points of zero variation
C.the magnetic latitude
D.magnetic dip

单项选择题

A.magnetic latitudes
B.magnetic declinations
C.dip
D.isogonic lines

单项选择题

A.complete and often very poor surveys
B.correct and often very good surveys
C.inadequate and often very old surveys
D.adequate and present surveys