Certain dangerous goods are required “to be stowed in a mechanically ventilated space”. When such goods are carried in a closed Ro/Ro cargo space or a special category space，this space should（）.

单项选择题Certain cargoes must be segregated because of their（）.

A.inherent characteristics
B.weight
C.destination
D.danger to humans

单项选择题Cargoes which（）an explosive，inflammable，poisonous and corrosive nature are called dangerous goods.

A.is
B.are of
C.is of
D.are

单项选择题Can we change the location for the tung-oil（）that for the gum rosin?

A.by
B.for
C.into
D.with

单项选择题Calcium carbide and acetone are counteractive（）nature.

A.by
B.in
C.from
D.with

单项选择题At sea，on what occasion would you display two red lights at night or two black balls during the day?（）.

A.When vessel is on fire
B.When vessel is not under command
C.When vessel is carrying the dangerous cargoes
D.When vessel is restricted in her ability to maneuver