单项选择题
A wooden float placed between a ship and a dock to prevent damage to both is called a（）.
A.camel
B.dolphin
C.rat guard
D.wedge
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单项选择题
A term applied to the bottom shell plating in a double-bottom ship is（）.
A.bottom floor
B.outer bottom
C.shear plating
D.tank top -
单项选择题
A strong back refers to a（）.
A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay -
单项选择题
A spreader bar is used to（）.
A.increase the lifting capacity
B.increase the lifting radius
C.protect the slings
D.protect the upper part of a load
