单项选择题
As compared to carbon dioxide，dry chemical has which advantage?（）
A.Cleaner
B.Effective on metal fires
C.Greater range
D.More cooling effect
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As a vessel changes course to starboard，the compass card in a magnetic compass（）.
A.remains aligned with compass north
B.also turns to starboard
C.first turns to starboard then counterclockwise to port
D.turns counterclockwise to port -
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As a licensed Merchant Marine Officer you are expected to（）.
A.obtain a weather forecast before setting out from port
B.listen to weather forecasts on the radio while enroute
C.understand all broadcast weather warning information
D.All of the above
