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

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

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

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

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

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