单项选择题
As defined in the regulations governing marine casualties a “marine employer” may be the（）.
A.owner B.agent C.Master D.All of the above
单项选择题 As compared to carbon dioxide，dry chemical has which advantage?（）
单项选择题 As a vessel changes course to starboard，the compass card in a magnetic compass（）.
单项选择题 As a rule，ships of most configurations，when drifting in calm water with negligible current，will lie（）.
