单选题With reference to the requirements under IMO MODU CODE，Space in which an explosive gas/air mixture is likely to occur in normal operation of Drilling Units is considered as（）.AZone0BZone1CZone2DZone3
单选题
With reference to the requirements under IMO MODU CODE，Space in which an explosive gas/air mixture is likely to occur in normal operation of Drilling Units is considered as（）.
A
Zone0
B
Zone1
C
Zone2
D
Zone3
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