单项选择题

If the weights are concentrated in the middle part，then（）will happen on board the ship.

A.hogging
B.stiffness
C.sagging
D.listing

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单项选择题

If a vessel is sagging，what kind of stress is placed on the sheer strake?（）

A.Compression
B.Tension
C.Thrust
D.Racking

单项选择题

Frames to which the tank top and bottom shell are fastened are called（）.

A.floors
B.intercostals
C.stringers
D.tank top supports

单项选择题

Floors aboard ship are（）.

A.frames to which the tank top and bottom shell are fastened on a double bottomed ship
B.transverse members of the ships frame which support the decks
C.longitudinal beams in the extreme bottom of a ship from which the ship's ribs start
D.longitudinal angle bars fastened to a surface for strength