单项选择题
A.the SW outboard valves
B.the tailshaft LO stop valve
C.the drain valve of the boiler
D.propeller shaft sealing device
单项选择题 When ship in the dock repairing, engine department should emphasize on the inspection of（）
单项选择题 We should apply for annual spare parts according to（） Ⅰ.he need of annual overhaul Ⅱ.he storage of spare parts Ⅲ.he storage capacity of spare parts room
单项选择题 If the ordered spare parts have been modified by manufacturer, which of the following should be pay attention to?（）