单项选择题

My position has been obtained （） astronomical observation．

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

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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
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单项选择题

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

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D.latitude or longitude scale at the middle of the scale