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【单选题】
关于样本含量估算，不正确的是A.
检验项目需要有足够的样本含量
B.
病例组或对照组的样本含量可用公式计算法或查表法估计
C.
可参照下列参数估算：显著性水平值α一般取0.05、容许误差值W(或δ)一般在0.05～0.10之间、率的估计值p由灵敏度(病例组)和特异度(对照组)估计
D.
一般诊断性研究的样本量不小于100例，特殊情况下样本量不小于30例
E.
依据临床情况决定
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举一反三
【简答题】风险和费用转移在不同时间的有_______。
【简答题】风险和费用转移在不同时间的有_______。
【简答题】Task 1. Pair Work Act out the sample dialogue with yourpartner. 2. Group Discussion Work in groups. Discuss the followingpoints and prepare to report to the class. ➢ What are the necessary qualitiesfo...
【简答题】Task 1. Pair Work Work in pairs. Act out the sample dialogue with your partner. 2. Group Discussion Work in groups and share your views on the following questions. 1)What was your dream job when you w...
【单选题】Mrs green is out. I have to _____ her baby. [ ]
A.
look for
B.
look up
C.
look after
D.
look around
【单选题】Mrs. Green is out. I have to ___________ her baby.
A.
look after
B.
look up
C.
look for
D.
look around
【单选题】Mrs. Green is out. I have to ________ her baby. [ ]
A.
look around
B.
look up
C.
look for
D.
look after
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