皮皮学，免费搜题
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【单选题】
在正态分布的条件下，以2【图片】(提示：【图片】为估计标准误差)为距离作平行于回归直线的两条直线，在这两条平行直线中，包括的观察值的数目大约为全部观察值的（）A.
68.27%
B.
90.11%
C.
95.45%
D.
99.73%
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】A．He is living in an apartment in the city. B．He is helping his brother look for an apartment. C．He already found an apartment. D．lie is looking for an apartment with a girl.
【简答题】A．He is late for his work. B．It takes long time for him to go to work. C．He is excited for driving to work. D．He just drove to make sure the time to get to work.
【简答题】A．He is using his computer for work purposes. B．He often plays s on his computer. C．His computer makes his life easier. D．His cannot use a computer.
【单选题】膜型免疫分子包括:
A.
淋巴细胞抗原识别受体、MHC分子、CD分子、补体
B.
CD分子、MHC分子、细胞因子
C.
淋巴细胞抗原识别受体、细胞因子、MHC分子
D.
淋巴细胞抗原识别受体、MHC分子、CD分子
E.
MHC分子、CD分子、补体
【简答题】A．He is looking for a job. B．He is looking at his girlfriend. C．He is buying something for his girlfriend. D．He is introducing himself.
【单选题】成人胸外按压的深度和频率为
A.
1～3cm，80～100次／分
B.
2．5～4cm，80～100次／分
C.
4～5cm，80～100次／分
D.
2．5～4cm，100次／分
E.
4～5cm，100次／分
【单选题】Greenspan is famous for his syntax, in other words, ______.
A.
he is skillful for hiding his opinion
B.
he has excellent grammar and vocabulary
C.
he always lies to the American public
D.
he gives lots of well-known speeches
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