Those ship’s tanks that are particularly important for trimming the ship are the（）.

The words PIPE，BUTT，TUN AND PUNCHEON all refer to（）.

A.the sizes of casks
B.various lengths of timber
C.structural shapes used in construction
D.viscosities of liquid cargoes

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The welds used to join shell plates in flush construction are known as（）.

A.butt welds
B.seam welds
C.fillet welds
D.continuous welds

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