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
单项选择题 An azimuth angle for a body is measured from the（）.
单项选择题 An authorized light to assist in the identification of submarines operating on the surface is a(n)（）.
单项选择题 An aneroid barometer on a boat should always be（）.
