单项选择题
A.Detachable B.Open C.Pear shaped D.Stud link
Which tackle arrangement has the LEAST mechanical advan...
单项选择题Which tackle arrangement has the LEAST mechanical advantage（）.
A.Single whip B.Gun tackle C.Luff tackle D.Twofold purchase
Which mooring line prevents sideways motion of a vessel...
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
When lowering lifeboats in heavy seas，a good practice i...
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
