You are operating a lift boat.When beginning to jack down you should（）.<br>A:Jack down one leg at a time<br>B:Jack up first，then down<br>C:Undog doors to the engine room<br>D:Assemble all personnel on the main deck

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

出自：海船船员证

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