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

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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

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

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Solid green arrows on the main body of a pilot chart indicate （）.

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

Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．

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