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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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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

單項(xiàng)選擇題

A Mercator chart is a （）.

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

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