心电图QT间期延长，提示（）
A.新生儿低血糖
B.新生儿低钙血症
C.新生儿脱水热
D.新生儿溶血病
E.新生儿高血糖
参考答案：B
求曲线y=x2+3x+1求过点（2，5）的切线的方程．
A client with hepatitis A expresses concern that his friends may also acquire hepatitis. Which of the following is most commonly used for prophylactic treatment of people exposed to hepatitis A
A．Penicillin.
B．Sulfadiazine (Microsulfon).
C．Immune serum globulin.
D．Interferon.
