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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單項(xiàng)選擇題

My position has been obtained （） astronomical observation．

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

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