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 oil
- Bat the top of the tank
- Cin the vent riser
- Done meter from the deck
问题
Before a tank is to be crude oil washe
参考解析：
分类：燃烧与爆炸题库
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