单项选择题
A system of cleaning the tanks by washing them with the cargo of crude oil while it is being discharged is known as（）.
A.cow
B.lot
C.cbt
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A vessel emitting harmful substances into the air or spilling oil into the sea is a（）.
A.polluter
B.emitter
C.spiller
D.oiler -
单项选择题
A vessel restricted by its ability to manoeuver by the nature of its work or its deep draft is（）.
A.hampered vessel
B.giving way vessel
C.vessel not under control
D.disabled vessel -
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A vessel, other than a rescue unit, designated to co-ordinate surface search and rescue operation within a specified area is known as（）.
A.salving vessel
B.co-ordinator surface search
C.mersar
D.the vessel being salved
