问题
问答题
内能的利用受到什么条件的限制？在航天飞机上，为什么不用内燃机作动力机？
答案
燃料燃烧需要氧气，而离开地球的航天飞机上缺乏氧气
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内能的利用受到什么条件的限制？在航天飞机上，为什么不用内燃机作动力机？
燃料燃烧需要氧气，而离开地球的航天飞机上缺乏氧气
An analyst does research about financial leverage and gathers the following information about a company:
| Units produced and sold in 2010 | 150000 |
| Degree of operating leverage at 150000 units | 2.5 |
| Degree of financial leverage | 2.0 |
| Expected growth rate of unit sales in 2011 | 10% |
A. 20%.
B. 25%.
C. 50%.