單項(xiàng)選擇題The buoy symbol printed on your chart is leaning to the northeast. This indicates （）.

A.you should stay to the north or east of the buoy
B.you should stay to the west or south of the buoy
C.the buoy is a major lighted buoy
D.nothing special for navigational purposes


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1.單項(xiàng)選擇題The agonic line on an isomagnetic chart indicates the （）.

A.magnetic equator
B.magnetic longitude reference line
C.points where there is no variation
D.points where there is no annual change in variation

2.單項(xiàng)選擇題Solid green arrows on the main body of a pilot chart indicate （）.

A.prevailing wind directions
B.prevailing ocean current directions
C.probable surface current flow
D.shortest great circle routes

3.單項(xiàng)選擇題On the south and the east coasts of Block Island are circles with a dot in the center and labeled CUP. This is a （）.

A.conspicuous object
B.steep depression in the surrounding hills that resembles a cup
C.domed structure useful for navigation
D.calling-up-point used for traffic control

4.單項(xiàng)選擇題Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．

A.published with
B.combined with
C.in connection with
D.subject to

5.單項(xiàng)選擇題My position has been obtained （） astronomical observation．

A.with
B.from
C.on
D.by