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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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

单项选择题

（）of my ship’s propeller is very strong.

A.The running reflection
B.The turning effect
C.The moving speed
D.The changing sensibility