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


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1.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

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

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

3.單項(xiàng)選擇題Magnetic information on a chart may be （）.

A.found in the center(s) of the compass rose(s)
B.indicated by isogonic lines
C.found in a note on the chart
D.All of the above

4.單項(xiàng)選擇題Entering from sea，a daymark on the port side of the channel would be indicated on a chart by a （）.

A.red triangle with the letter R
B.white triangle with the letters RG
C.green square with the letter G
D.white square with the letters GR

5.單項(xiàng)選擇題Distance along a track line is measured on a Mercator chart by using the （）.

A.latitude scale near the middle of the track line
B.longitude scale near the middle of the track line
C.latitude scale at the midlatitude of the chart
D.latitude or longitude scale at the middle of the scale