单项选择题
An engine compartment gasoline fire requires which type of extinguisher?（）
A.Carbon dioxide
B.Dry chemical
C.Foam
D.All of the above
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A.observer's meridian
B.Greenwich meridian
C.body's meridian
D.zenith distance -
单项选择题
An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.
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