單項(xiàng)選擇題The changes in the channel’s sands and buoys on this coast are （） this chart can not be considered as a safe guide of the channel．

A.frequent
B.so frequent
C.frequent that
D.so frequent that


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1.單項(xiàng)選擇題（）chart 3994，positions read from this chart should be shifted 0.03 minutes Northward．

A.To consider
B.To check
C.To examine
D.To agree with

2.單項(xiàng)選擇題A Mercator chart is a （）.

A.cylindrical projection
B.simple conic projection
C.polyconic projection
D.rectangular projection

3.單項(xiàng)選擇題A revised print of a chart is made （）.

A.after every major hydrographic survey of the area covered by the chart
B.when there are numerous corrections to be made or the corrections are extensive
C.when a low-stock situation occurs and minor corrections are made
D.every two years to update the magnetic variation information

4.單項(xiàng)選擇題All straight lines represent great circle tracks on a chart based on a(n) （）.

A.Mercator projection
B.polyconic projection
C.orthographic projection
D.gnomonic projection

5.單項(xiàng)選擇題Chart correction information is NOT disseminated through the （）.

A.Summary of Corrections
B.Local Notice to Mariners
C.Daily Memorandum
D.Chart Correction Card