單項(xiàng)選擇題

Restricted areas at locks and dams are indicated by（）.

A.Flashing red lights upstream and fixed red lights downstream
B.Yellow unlighted buoys
C.Signs and/or flashing red lights
D.Red daymarks upstream and green daymarks downstream

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單項(xiàng)選擇題

On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.

A.Indicates the limits of the navigable channel
B.Indicates a danger area
C.Is used to identify the characteristics of the light
D.Serves no significant purpose

單項(xiàng)選擇題

In very high latitudes，the most practical chart projection is the（）.

A.Mercator
B.Gnomonic
C.Azimuthal
D.Lambert conformal

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Restricted areas at locks and dams are indicated by（）.

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On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.

In very high latitudes，the most practical chart projection is the（）.

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On a chart，the characteristic of the light on a lighthouse is shown as flashing white with a red sector.The red sector（）.

In very high latitudes，the most practical chart projection is the（）.