正常P波的时间（），电压（）。
参考答案：<0.11s；<0.25mV
— Did that book give the information you needed?
— Yes, but ______, we had to read it almost entirely. [ ]
A. for finding it
B. to find it
C. finding it
D. by finding it
巴纳姆的公共关系手段是（）。
A.编制神话
B.实事求是
C.双向平稳
D.投公众所灯
