单项选择题
A.No placard is required; the tank openings must be sealed
B.Empty placard with corrosive placard
C.Residue label with the UN number
D.Black and white corrosive placard
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?（）.
单项选择题 You are on a containership. Which statement about the stowage of hazardous materials in containers is TRUE?（）.
单项选择题 A container with high cube would most likely be used to stow（）.