Before the project was started, we asked the designer to give us an _______ of the cost of building such a museum.
A. estimate
B. evaluation
C. assessment
D. announcement
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假设某一产品由3个单元串联组成,若每个单元工作1万小时的可靠度均为0.9,则该产品工作1万小时的可靠度为()。
A. 0.656
B. 0.729
C. 0.739
D. 0.811
He is ______ learned man, but she is ______ learned of all.
A. the most.., a most
B. the most.., the most
C. a most.., a most
D. a most.., the most
可用于剔除不良元器件,减少早期故障的可靠性试验是()。
A. 可靠性增长试验
B. 环境应力筛选试验
C. 可靠性测定试验
D. 可靠性鉴定试验
随机抽取样本时,必须对产品顺序进行排列的抽样方法是()。
A. 系统抽样
B. 简单随机抽样
C. 分层抽样
D. 整群抽样