单项选择题
At the required fire drill conducted aboard a ship，all persons must report to their stations and demonstrate their ability to perform the duties assigned to them（）.
A.by the toolpusher B.in the station bill C.by the person conducting the drill D.at the previous safety meeting
单项选择题 At night while the ship is tied up to the dock，a fire breaks out in a cargo hatch. After sounding the alarm，what should the person on watch do?（）
单项选择题 As compared to carbon dioxide，dry chemical has which advantage?（）.
单项选择题 As an extinguishing agent，foam（）.
