单项选择题
Tonnage openings must be closed by means of（）.
A.Press board
B.Steel hatch boards
C.Steel plates
D.Wooden hatch boards
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A.Floor-ceiling
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The strake on each side of the keel is called a（）.
A.Sheer strake
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C.Insulation strake
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The section of each end of a barge which is heavily reinforced to take the pressure of pushing is called the（）.
A.Headlog
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