问题
选择题
________their hats into the air, the fans of the winning team let out loud shouts of victory.[ ]
A. To throw
B. Thrown
C. Throwing
D. Being thrown
答案
答案：C
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________their hats into the air, the fans of the winning team let out loud shouts of victory.[ ]
A. To throw
B. Thrown
C. Throwing
D. Being thrown
答案：C
某企业技术改造有两个方案可供选择，各方案的有关数据见下表，设基准收益率为12%。
A、B方案的数据
| 方案 | 投资额(万元) | 年净收益(万元) | 寿命期 |
| A | 1000 | 400 | 6 |
| B | 1200 | 480 | 8 |