对工程设计中的技术问题,按照( )原则,向设计人提出建议。

为了鼓励客户多买商品而给予客户的折扣称为( )。

A.数量折扣
B．现金折扣
C．商业折扣
D．价格折扣

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What is learned about the copy machine?（）

A．It broke down the previous week.
B．It cannot make double-sided copies.
C．It will be delivered later that day.
D．It was purchased within the past five months.

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