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Which statement about entry into a water ballast tank that has been sealed for a long time is TRUE?
A) A "buddy system" should be used where someone enters the tank with you.
B) Sea water acts on the ship's metal and generates chlorine gas which may accumulate in poisonous quantities.
C) After ventilation and testing, and the tank is found safe for entry, someone should standby at the tank entrance while you are inside.
D) You should always wear a gas mask.
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