单选题The permant dunnage attached to the frames of the ship that aids in ventilation is (are) the（）.Ahatch boardsBtank topChatch beamsDsweat bettens
单选题
The permant dunnage attached to the frames of the ship that aids in ventilation is (are) the（）.
A
hatch boards
B
tank top
C
hatch beams
D
sweat bettens
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