经济效果评价的动态评价指标有( )。
A．投资收益率
B．内部收益率
C．净现值
D．净年值
E．利息备付率
参考答案：B,C,D
The term paper was due to December 1, but hard as he tried, he was unable to meet the _____ for it.
A．challenge
B．need
C．deadline
D．date
下面五种物质的沸点由高到低的顺序正确的是
①正戊烷 ②正庚烷 ③异戊烷 ④异丁烷
A．②①③④
B．②③④①
C．③②④①
D．①②③④
