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通过保通物流的发展经历，你认为保通物流自建配送中心的理由是什么？配送中心选址主要考虑的因素有哪些？(10分)

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The researchers wished to compare the six soil samples collected during experiments 1 and 2 according to permeability (ability of water to pass through them). A portion of each sample was placed in a separate cup with a filter bottom, and then the same amount of water was added to each cup. After one minute, the amount of water passing through each filter was measured. In order to draw any reliable conclusions about the permeability of the six original samples, all of the following conditions are necessary EXCEPT:

A. one minute is sufficient time for some amount of water to escape at least some of the cups.
B. the same amount of soil was added to all six cups.
C. in each cup, the proportions of sand, silt, and clay were the same as in the original sample.
D. the filters did not allow soil particles to escape through the bottoms of the cups.

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Assume that, in a third experiment, a seventh soil sample is taken from another area, then dried and separated using the same procedure as for the other six samples. If measurements show that the sample contains more silt than either sand or clay, then the sample is probably most similar in texture to either:

A. sample 1 from the forest or sample 3 from the grassy field.
B. sample 1 from the forest or sample 3 from the forest.
C. sample 1 from the grassy filed or sample 3 from the grassy field.
D. sample 2 from the forest or sample 1 from the grassy field.

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企业应用矩阵法进行项目组合评估时，对处于技术组合分析图中第一象限的项目，企业应采取的策略是()。

A. 放弃投资
B. 维持现有投资
C. 重点投资
D. 与竞争对手保持同等投资

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某企业运用提前期法来确定各车间的生产任务。装配车间(最后车间)l0月份应生产到1000号，产品的平均日产品为10台，该产品在机械加工车间的出产提前期为50天，则机械加工车间10月份出产的累计号是()。

A. 600
B. 900
C. 1500
D. 1800

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