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單項(xiàng)選擇題

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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單項(xiàng)選擇題

Isogonic lines are lines on a chart indicating （）.

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

單項(xiàng)選擇題

Lines on a chart which connect points of equal magnetic variation are called （）.

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