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

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单项选择题

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

单项选择题

On chart，bearings to near objects should be used in preference to objects farther off，because（）.

A.a small error in bearing or in laying it down on the chart has a greater effect in misplacing the position the longer the line to be drawn
B.all scales are kept updated for vital information by Notices to Mariners
C.the larger the scale of the chart，the greater the detail that can be shown on it
D.the mariner using the medium scale charts for passage along a coast need not transfer on to a large scale for short distances

单项选择题

On a Mercator chart，1 nautical mile is equal to（）.

A.1 minute of longitude
B.1 degree of longitude
C.1 minute of latitude
D.1 degree of latitude

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