问题
单项选择题 A1型题
在病例对照研究中，选择偏倚主要包括（）
A.入院率偏倚
B.奈曼偏倚
C.检出征候偏倚
D.时间效应偏倚
E.以上均是
答案
参考答案：E
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在病例对照研究中，选择偏倚主要包括（）
A.入院率偏倚
B.奈曼偏倚
C.检出征候偏倚
D.时间效应偏倚
E.以上均是
参考答案：E
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| Gao Yueling, a Chinese leader said, " We 1 152 child protection center(儿童保护中心) since 2006. 2 the center in China will be added to 300 by 2011. "The centers are built to get homeless 3 off the streets. They will make the youngsters( aged up to 18) 4 a place to sleep and eat," she said. "The children are welcome to stay 5 they are together with their parents. " "While at the protection centers, children will also 6 free education and some training to get ready for adult life. Some centers will also ask 'parents' to 7 the children, while 8 young-sters are found homes with local families. " she said. By the end of March of this year, the center had helped some "problem" children. " Most of them left home 9 poor life or parents," she said. "We will help them to make contact with their families and will also 10 for their bus or train tickets home. " | ||||
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