单选题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?（）.ANo placard is required; the tank openings must be sealedBEmpty placard with corrosive placardCResidue label with the UN numberDBlack and white corrosive placard
单选题
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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