单项选择题
A.Discharge a cylinder of nitrogen into the container
B.Shade the container and periodically hose it down
C.Seal any ventilation openings and add dry ice
D.Spread ice over the top layer and in any voids within the container
单项选择题 You are on a container vessel. What concerning the handling and stowage of containerized hazardous materials is TRUE?（）.
单项选择题 You are on a containership carrying a tank container that had been filled with sodium hydroxide solution. The container is empty but has not been cleaned. Which，if any，placard is required?（）.
单项选择题 You are on a containership. The cargo includes a container of small arms ammunition，a container of lead-acid storage batteries and bottles of methyl acetylene. Which statement is TRUE?（）.