Upon underwater（）by divers，there are no apparent（）on the bottom plates of the said vessel.

单项选择题To reduce the number of strakes at the bow，two strakes are tapered and joined at their ends by a single plate. This plate is known as a（）.

A.cover plate
B.joiner
C.lap strake
D.stealer plate

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

单项选择题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

单项选择题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

单项选择题The welds used to attach stiffeners to a plate are known as（）.

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