单项选择题
Which type of link is generally used to connect shots of anchor chain（）.
A.Detachable B.Open C.Pear shaped D.Stud link
单项选择题 Which tackle arrangement has the LEAST mechanical advantage（）.
单项选择题 Which mooring line prevents sideways motion of a vessel moored to a pier（）.
单项选择题 When lowering lifeboats in heavy seas，a good practice is to rig frapping lines（）.
