Which of the following statement about the normal distribution is FALSE()

A. It is completely described by its mean and standard deviation.

B. It has a skewness of 1.

C. It is bell-shaped.

患者，男性，行胆总管切开取石、T管引流术。

胆道T管引流的患者胆道远端通畅的表现是

A．腹痛和黄疸减轻，引流量增多

B．体温正常，引流量增多

C．上腹胀痛，引流量骤减

D．食欲好转，黄疸消退，引流量减少

E．黄疸消退，引流量增多，食欲无变化