单项选择题
When the dock is refilled with water after docking repair, the first work which should be done by engineers is （）
A.igniting boiler B.releasing air in sea water system C.starting generator D.cut off shore power
单项选择题 During the deck repair,（） should be measured firstly before tail shaft is drawn out.
单项选择题 To ensure the quality of dock repair, C/E should know very well （）
单项选择题 Which of the following items don’t belong to dock repair works?（）
