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
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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
下列不属于学习迁移的条件的是( )
A. 观念或功能的固着
B. 原有经验的特性
C. 学习材料间的相似性
D. 学习的定势
Her husband ______ on in the hospital this time yesterday.
A. being operated
B. was being operated
C. was operating
D. operated
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