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單項(xiàng)選擇題

When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery,check it().

A.one meter from the tank bottom and one meter below the tank top
B.one half the ullage of the tank and one meter below the tank top
C.one half the ullage of the tank and one meter above the tank bottom
D.at three meter intervals from the tank top to the bottom

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