单项选择题
（）of the following conditions will cause a vessel’s bottom to be subjected to tension stresses.
A.Concentration of weight aft
B.Concentration of weight forward
C.Concentration of weight amidships
D.Concentration of weight at both ends of the vessel
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（）of my ship’s propeller is very strong.
A.The running reflection
B.The turning effect
C.The moving speed
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单项选择题
A crack in the deck plating of a vessel may be temporarily prevented from increasing in length by（）.
A.cutting a square notch at each end of the crack
B.drilling a hole at each end of the crack
C.slot-welding the crack
D.welding a doubler over the crack
