单项选择题
A.have B.have been C.has D.has been
A system of cleaning the tanks by washing them with the...
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
A vessel emitting harmful substances into the air or sp...
单项选择题A vessel emitting harmful substances into the air or spilling oil into the sea is a（）.
A.polluter B.emitter C.spiller D.oiler
A vessel restricted by its ability to manoeuver by the ...
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
