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Before welding can be done in a tank that has carried petroleum products，a certificate must be obtained from（）.

单选题
2022-02-24 14:37
A、the Customs
B、the Register Bureau of Shipping
C、the Shipyard Fire Department
D、a certified gas chemist
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正确答案
D
试题解析
标签： 液体散装危险品与IBC规则
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