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

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

出自：海船船员证

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