4 . changes of layout, additional purchases and maintenance can be carried out efficiently 4.设计变更和追加购置时,维护方便。
And all orders are cumulative, so additional purchases over the two-year term may qualify you for an even better discount level 所有订购量均可累积计算,所以如果您在两年有效期内继续订购,则可获得更优惠的折扣级别。