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