A.sea valve chest, sect valve, thruster
B.bilge motherboard, steering and the shaft system
C.sea water system
D.fresh water system
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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
A.Ⅰ
B.Ⅱ
C.Ⅰ+Ⅱ
D.Ⅲ
A.quality
B.reliability
C.price fluctuating
D.applicability
A.the reason of replacing
B.the course of replacing
C.crews who do this work
D.where and when the replacing being done
A.Cooling water is alkalescence
B.cooling water is acidity
C.cooling water has salinity
D.cooling water has impurity
A.alkale scence
B.acidity
C.salinity
D.impurity
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