题目内容
（请给出正确答案）
Estimates of the number of homeless Americans range from 350,000 to three million.
请问2015年12月大学英语四级考试模拟试卷1第74题如何翻译？
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23 Upon completion of 75% of the project, the original schedules and cost estimates that were submitted at the inception of the project are referred to as the:
A. Baseline costs
B Budgeted costs.
C. Estimates upon completion costs
D. Scheduled costs
E. None of the above
Parametric cost estimating involves
A.using the WBS to do bottom up estimates
B.defining the perimeters of the life-cycle
C.calculating the individual estimates of work packages
D.using a statistical model to estimate costs
E.A and C
The Program Evaluation and Review Technique (PERT) is a method of scheduling projects. In the context of risk, PERT is better than the Critical Path Method because it deals with the _______ associated with ________.
A.Logic, cost estimates
B.Logic, schedule estimates
C.Certainty, cost estimates
D.Uncertainty, schedule estimates
E.Certainty, schedule estimates
According to the estimates, how many people there have been infected by the disease？
A．2000.
B．20000.
C．300.
D．3000--10000.
A. low salvage value estimates and long average lives.
B. high salvage value estimates and long average lives.
C. high salvage value estimates and short average lives.
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