單項(xiàng)選擇題

The arrangement of charts in the catalogue is（）.

A.on a regional basis
B.on a national basis
C.shown orderly
D.appeared from A to W

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單項(xiàng)選擇題

That the scale of any part of a chart to be larger than the scale of the survey is（）.

A.very rare
B.common
C.often
D.reasonable

單項(xiàng)選擇題

Particular care is needed when navigating in the vicinity of（）as very few of these features have been fully surveyed to modern standards to determine their correct position，full extent，or the least depth over them.

A.SW of Cocos Islands
B.oceanic dangers or seamounts
C.undiscovered dangers
D.the continental shelf

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