This contact is part ______the after-sales service.
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This increases the chances that they’ll come ______ to make purchases or will praise their experience with the brand.
A. in
B. out
C. back
After-sale service is______
A. important
B. not important
C. unnecessary
negotiation的中文意思是______
A. 目标
B. 谈判
C. 讨价还价
某公共建筑进行机械排烟系统设计,排烟风机风量选取时应选择( )。
A. 系统设计风量
B. 系统计算风量
C. 最大防烟分区的风量
D. 系统所有防烟分区风量之和