下列哪项不是肝性脑病的诱因
A．消化道出血
B．高钾性酸中毒
C．便秘
D．低血糖
E．缺氧
参考答案：B
血镁升高可见于（）
A.甲状旁腺功能亢进
B.原发性醛固酮症
C.Addison病
D.糖尿病酸中毒
E.慢性腹泻
(74) is NOT served by building a prototype.
A．It takes the place of the final system
B．It is used as the foundation of the larger projects
C．It assists in estimating the cost of the project
D．It assists in gathering software requirements
