无规线团模型
参考答案:Flory用统计热力学推导得出如下结论:在非晶态聚合物中,高分子链无论在θ溶剂中或者在本体中,均具有相同的旋转半径,呈现无扰的高斯线团状态。
在长期用药的过程中,突然停药易引起心动过速,这种药物最可能是
A.哌唑嗪
B.肼屈嗪
C.普萘洛尔
D.甲基多巴
E.利血平
Which of the following functions would the nurse expect to be unrelated to the placenta
A.Production of estrogen and progesterone.
B.Detoxification of some drugs and chemicals.
C.Exchange site for food, gases, and waste.
D.Production of maternal antibodies.