______使代议制真正在政治生活中成为事实。( )
A．普选制
B．比例代表制
C．多数代表制
D．公开选举
参考答案：A
对于心房颤动的诊断，下列哪项不正确（）
A.心律绝对不齐
B.心音强弱不等
C.容易听到第四心音
D.心率大于脉率
E.心电图P波消失，代之f波
Which of the following statements regarding confidence intervals is TRUE（）
A. The higher the alpha level, the wider the confidence interval.
B. The relationship between the alpha level and the confidence interval cannot be ascertained.
C. The lower the alpha level, the wider the confidence interval.
