单选题Before welding in a tank that has carried petroleum products，the tank must be certified by （）.Athe Coast GuardBthe ABSCthe shipyard fire departmentDa certified marine chemist
单选题
Before welding in a tank that has carried petroleum products，the tank must be certified by （）.
A
the Coast Guard
B
the ABS
C
the shipyard fire department
D
a certified marine chemist
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