A.spring-loaded line thrower
B.hand thrown buoyant line
C.shoulder type line throwing gun
D.heaving line
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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
A.The running reflection
B.The turning effect
C.The moving speed
D.The changing sensibility
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
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Good seamanship while towing in heavy weather requires all of the following EXCEPT（）.
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How is a safe water mark，that can be passed close aboard on either side，painted and lighted?（）
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How does foam extinguish an oil fire?（）
How can you estimate the position of a tropical storm’s center?（）
How could lashing gear used aboard Ro-Ro vessels be stowed when not in use?（）
High clouds，composed of small white flakes or scaly globular masses，and often banded together to form a “mackerel sky”，would be classified as（）.
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