单选题You are operating a lift boat.When beginning to jack down you should（）.AJack down one leg at a timeBJack up first，then downCUndog doors to the engine roomDAssemble all personnel on the main deck
单选题
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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