单选题Before welding can be done in a tank that has carried petroleum products, a certificate must be obtained from（）.Athe customsBthe register bureau of shippingCthe shipyard fire departmentDa certified gas chemist
单选题
Before welding can be done in a tank that has carried petroleum products, a certificate must be obtained from（）.
A
the customs
B
the register bureau of shipping
C
the shipyard fire department
D
a certified gas chemist
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