问题
单项选择题
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
答案
参考答案：D
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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
参考答案：D