单选题Before a tank is to be crude oil washed，the oxygen content in the tank must be measured at a position（）.Aimmediately above the level of the oilBat the top of the tankCin the vent riserDone meter from the deck
单选题
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
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相关考题：
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