单项选择题
The above mentioned ship has been duly（）in accordance with the provisions of the convention referred to.
A.relayed
B.delayed
C.conveyed
D.surveyed
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Tensile stress is a result of two forces acting in（）.
A.opposite directions on the same line，tending to pull the material apart
B.opposite directions on the same line，tending to compress the object
C.opposite directions along parallel lines
D.the same direction along parallel lines -
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Sometimes it is desirable to connect a member both by riveting and welding. Which statement is TRUE concerning this procedure? （）
A.Tearing through the member is more likely in this type connection
B.The weld may be broken by the stresses caused by riveting
C.The weld increases the tensile stress on the rivet heads
D.The welding must be completed before the riveting commences -
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Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.
A.shall
B.should
C.may
D.would
