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

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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

单项选择题

What term indicates the line drawn at the top of the flat plate keel（）.

A.Base line
B.Molded line
C.Designer's waterline
D.Keel line