All of the following rules are true about the lowest level WBS work packages except work packages:
A. can be completed without interruption in one location。
B. can be confidently estimated。
C. must be assigned to only 1 person。
D. must be completed within 80 hours。
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假设好车的价格是六千,差车的价格是两千,在旧车质量只有卖方可察的情况下,花四千元能买到好车的可能性更大。()
无公害蔬菜在菜市场环境中没有市场的主要原因是买卖双方信息不对称。()
买方对旧车的评价变得更高,使市场更不可能失灵。()