單項(xiàng)選擇題

My position has been obtained （） astronomical observation．

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

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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

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