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?().
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
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