单项选择题
Which item may be substituted for，in the fireman’s outfit，on a cargo vessel?（）
A.fire ax B.flashlight C.rigid helmet D.flame safety lamp
单项选择题 Which extinguishing agent will cool down a heated bulkhead in the least amount of time?（）
单项选择题 When loading or discharging dry mud or cement，crew members should use goggles and（）.
单项选择题 When collecting condensation for drinking water，（）.
