计划展望期内，越靠近计划起点的需求越不能随意改变。
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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。
A. 对
B. 错
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.
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