When measuring the oxygen content of the cargo tanks prior to loading cargoes requiring vapor recovery，check it（）.<br>A:one meter from the tank bottom and one meter below the tank top<br>B:one half the ullage of the tank and one meter below the tank top<br>C:one half the ullage of the tank and one meter above the tank bottom<br>D:at three meter intervals from the tank top to the bottom

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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