单项选择题

A common class of wire rope is the 6X37 class.What does the 37 represent（）.

A.Number of wires in the inner core
B.Number of strands per wire rope
C.Tensile strength of the wire
D.Number of wires per strand

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A Chinese stopper（two lines）will hold best when you（）.

A.fasten the bitter ends to the mooring line with half hitches
B.twist the ends together and hold them in the direction of the pull
C.twist the ends together and hold them in the direction opposite to the pull
D.twist the ends together and hold them at right angles to the mooring line

单项选择题

A chain bridle is used when towing astern because it（）.

A.Is easy to connect
B.Provides an effective catenary and absorbs shock due to its weight
C.Makes rigging a swivel unnecessary
D.Prevents the tow from yawing by the drag of the chains in a seaway

单项选择题

A cargo boom is a（）.

A.double sized mattress consists of more than 890 coils
B.spar extending from a mast or a king post
C.flap（Becker rudder）can be fitted to the rudder’s trailing edge
D.bridle arrangement having a long beam of the length of the container