单项选择题
A 30，000 DWT tanker is required to have an IOPP certificate when（）
A.engaged in the coastwise trade
B.going foreign
C.calling at ports in another country signatory to MARPOL 73/78
D.carrying cargoes listed in the MARPOL regulations
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相关考题
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单项选择题
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
