The sludge tank installed in the diesel engine room is used to collect（） Ⅰ.sludge from the fuel oil settling tanks ad centrifuge Ⅱ.water that has been collected in the settling tank
- AⅠonly
- BⅡ only
- CbothⅠand Ⅱ
- DneitherⅠor Ⅱ
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