Before welding in a tank that has carried petroleum products，the tank must be certified by （）.<br>A:the Coast Guard<br>B:the ABS<br>C:the shipyard fire department<br>D:a certified marine chemist

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

出自：海船船员证

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