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单选题
To determine which grades of cargo a tanker is permitted to carry you should（）.
A
refer to the vessel's Certificate of Inspection
B
examine the cargo tanks and fittings
C
ask the terminal supervisor or his representative
D
check the loading order
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单选题An inert gas system installed on a tanker is designed to（）.A
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existing crude oil tanker of 20000 tons deadweight and underB
new crude oil tanker of 20000 tons deadweight and underC
existing crude oil tanker of 20000 tons deadweight and aboveD
new crude oil tanker of 20000 tons deadweight and above
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