单项选择题
For an OSV not on an international voyage，an approved substitute for an impulse projected type line throwing appliance is a（）.
A.spring-loaded line thrower
B.hand thrown buoyant line
C.shoulder type line throwing gun
D.heaving line
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（）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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A.The running reflection
B.The turning effect
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A.cutting a square notch at each end of the crack
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