The permant dunnage attached to the frames of the ship that aids in ventilation is (are) the（）.<br>A:hatch boards<br>B:tank top<br>C:hatch beams<br>D:sweat bettens

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

出自：海船船员证

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