单项选择题
A.sea valve chest, sect valve, thruster
B.bilge motherboard, steering and the shaft system
C.sea water system
D.fresh water system
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?（）
单项选择题 When replacing a part with a spare one, we should fill in tile spare parts consume table in time and make a mark in brief for （）