单项选择题
A.chief engineer
B.surveyor
C.the engineer
D.the technique personnel of the shipyard
单项选择题 During the dock repair, when installing the tail shaft and propeller, who should be on the spot to supervise?（）
单项选择题 When the vessel entering the dock, the first work that engineer should contact with the shipyard （）
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 （）