单项选择题
（）of the following items is not in the charge of Chief Officer in repairing operation.
A.hull cleaning B.derusting and painting C.the maintenance of boiler D.docking and undocking
单项选择题 （）about 20 sq.m to be sand-blasted.
单项选择题 Damaged bulkheads often take a permanent set which is independent of the panting or bulge caused by water pressure. To control this，you should（）.
