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
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（）.
单项选择题 As a licensed Merchant Marine Officer you are expected to（）.
