单项选择题
What are the two main types of stud link chain?（）
A.Oil Rig chain and Oil Field Stud Link chain
B.Flash-butt welded chain and Di-Lok chain
C.Flash-butt welded chain and Oil Rig chain
D.Oil Field Stud Link chain and Flash-butt welded chain
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A.Continue on the same course and speed
B.Alter your course to the right
C.Slow to 8.5 knots
D.Alter your course to the left -
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Under identical load conditions，nylon，when compared with natural fiber line，will stretch（）.
A.less and have less strength
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Uncoiling manila line improperly can result in a(n)（）.
A.number of fishhooks
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D.increase in deterioration of the line
