单项选择题

You have been towing astern and have just let go the tow.Your deckhands are pulling in and faking the towline by hand on the stern.The most dangerous action to take is to（）.

A.continue ahead at slow speed
B.continue ahead at half speed
C.stop your engines
D.back down on your engines

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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

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