软件开发人员对用户需求的理解有偏差，这将导致软件产品与用户的需求不一致，是产生软件危机的唯一原因。
参考答案：错
All else being equal, a decrease in expected yield volatility would most likely cause the price of:（）
A. both a callable bond and a putable bond to decrease.
B. a callable bond to increase and the price of a putable bond to decrease.
C. a callable bond to decrease and the price of a putable bond to increase.
婴幼儿镇静药用量通常为（）
A.10%水合氯醛0.1ml/kg
B.10%水合氯醛0.5ml/kg
C.10%水合氯醛1.5ml/kg
D.10%水合氯醛2.0ml/kg
E.10%水合氯醛2.5ml/kg
