单项选择题
Those ship’s tanks that are particularly important for trimming the ship are the（）.
A.domestics
B.settlers
C.deeps
D.peaks
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The words PIPE，BUTT，TUN AND PUNCHEON all refer to（）.
A.the sizes of casks
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The welds used to join shell plates in flush construction are known as（）.
A.butt welds
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单项选择题
The welds used to attach stiffeners to a plate are known as（）.
A.butt welds
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