童年期所指的年龄阶段是
A.三岁至五六岁
B.五六岁至十一二岁
C.六七岁至十一二岁
D.六七岁至十三四岁
参考答案:B
Janny ____ have kept her word. I wonder why she changed her mind. [ ]
A. must
B. should
C. need
D. would
敏感性分析的绝对值方法,是计算( )。
A.因素变动值
B.指标变动值
C.敏感性系数
D.临界点