问题
选择题
Our teacher ______ to Beijing many times . He knows Beijing very well.[ ]
A. goes
B. is going
C. has gone
D. has been
答案
答案：D
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Our teacher ______ to Beijing many times . He knows Beijing very well.[ ]
A. goes
B. is going
C. has gone
D. has been
答案：D
某投资方案寿命5年，每年净现金流量见下表，折现率10%，到第5年恰好投资全部收回，则该公司的财务内部收益率( )。
| 年份 | 0 | 1 | 2 | 3 | 4 | 5 |
| 净现金流量(万元) | -11.84 | 2.4 | 2.8 | 3.2 | 3.6 | 4 |
A．＜10%
B．=10%
C．＞10%
D．无法确定