单选题Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.Aonly when fully loadedBif one or more tanks are fullCwhen transferring cargoDonly when the barge is being towed
单选题
Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.
A
only when fully loaded
B
if one or more tanks are full
C
when transferring cargo
D
only when the barge is being towed
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