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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注册验船师
注册验船师
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（）.
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