单项选择题

You are operating a lift boat.When beginning to jack down you should（）.

A.Jack down one leg at a time
B.Jack up first，then down
C.Undog doors to the engine room
D.Assemble all personnel on the main deck

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单项选择题

You are handling a mooring line and are instructed to Check the line.What should you do（）.

A.Ensure the bight is not fouled by taking up slack
B.Pay out the line smartly and keep it free for running
C.Secure the line by adding more turns
D.Surge the line so it maintains a strain without parting

单项选择题

Which will cause a wire rope to fail（）.

A.Using a medium graphite grease as a lubricant
B.Operating a winch too slow
C.Using a sheave with an undersized throat
D.A sheave diameter of 24 times the wire's diameter

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