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
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Which tackle arrangement has the LEAST mechanical advantage（）.
A.Single whip
B.Gun tackle
C.Luff tackle
D.Twofold purchase -
单项选择题
Which mooring line prevents sideways motion of a vessel moored to a pier（）.
A.A line led forward from the bow
B.A line led aft from the bow
C.A line led in the same direction as the keel
D.A line led at a right angle to the keel -
单项选择题
When lowering lifeboats in heavy seas，a good practice is to rig frapping lines（）.
A.on only the forward falls
B.on only the after falls
C.with a lead of about 45 degrees to the boat
D.from the falls to the main deck of the vessel
