Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.<br>A:immediately above the level of the oil<br>B:at the top of the tank<br>C:in the vent riser<br>D:one meter from the deck

Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.
A:immediately above the level of the oil
B:at the top of the tank
C:in the vent riser
D:one meter from the deck

出自：海船船员证

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