单选题A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must（）.Abe visible from both sides and from forward and aftBindicate NO SMOKINGCbe displayed only while transferring cargo and fast to a dockDuse black lettering on a white background
单选题
A tank vessel transferring non-flammable hazardous cargo in bulk must display warning signs. These signs must（）.
A
be visible from both sides and from forward and aft
B
indicate NO SMOKING
C
be displayed only while transferring cargo and fast to a dock
D
use black lettering on a white background
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