2. 首页 > 题库三 >
  2. 问题

脊髓灰质炎活疫苗预防试验结果表明，接种疫苗组儿童的脊髓灰质炎发病率为16/10万，接受安慰剂组儿童的发病率为57/10万，该疫苗的保护率是：（）

7 查阅

脊髓灰质炎活疫苗预防试验结果表明，接种疫苗组儿童的脊髓灰质炎发病率为16/10万，接受安慰剂组儿童的发病率为57/10万，该疫苗的保护率是：（）

A.0.28

B.0.45

C.0.72

D.0.87

E.无法计算

参考答案:

答案：C

相关问题:
  • 哪种实验室适合以下描述实验室结构和设施、安全操作规程、安全设备适用
  • 一个国家只要组织得力，措施得当，有可靠的疫苗，就完全能靠自身的力量独自战
    • 随便看看:
  • 健康养生
  • 亲子
  • 胎教
  • 孕妇健康
  • 中药百科
  • 心理

    • Ta老师-周边问题

    1.
    Greek tragic-comedy and Indian Sanskri
    2.
    Terri Shiavo entered（）in 1990 for undete
    3.
    Terminally ill people appeal for eutha
    4.
    After the civil war, many performers o
    5.
    Although he made a great deal of money
    6.
    Although he’s only 16 he has very（）idea
    7.
    Try to（）as many children as possible in
    8.
    Of all the sorrows she had to（）, none wa
    9.
    Kodak’s decision not to（）the role of of
    10.
    Human control of fire goes back far en
    11.
    Meditation(静思)techniques, in contras
    12.
    While schools emphasize its usefulness
    13.
    The film he directed two decades ago s
    14.
    She finally（）films after an acclaimed st
    15.
    “I’m self-employed and need the Inte
    16.
    Mr. Jobs has a reputation as a control
    17.
    It is a team packed with experienced a
    18.
    The fight for（）and economic equality is
    19.
    Sensory details are those details that
    20.
    Outlining, mapping and summarization a
    版权所有,保留一切权利！© 2018-2023 Ta老师 Talaoshi.com 湘ICP备18019507号-1 联系QQ:469958。