为了提高MRP的处理效率,一般采用的是自上向下、逐层处理的方法。
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A funny thing happened on the way to __________: we stopped talking to one another.
The park was filled with people talking on __________.
Evidently, the cordless __________ is preferable to human contact.
With __________ and instant messaging over the Internet, we can communicate without seeing or talking to one another.