问题
选择题
| 远距离输送一定功率的交流电，若输送电压提高到原来的n倍，则（ ） A．输电线上的电压损失减少了1/n倍 B．输电线上的电流减少了1/n倍 C．输电线上的电能损失减少了1/n2倍 D．输电线上的电能损失减少到原来的1/n2倍 |
答案
答案：D
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| 远距离输送一定功率的交流电，若输送电压提高到原来的n倍，则（ ） A．输电线上的电压损失减少了1/n倍 B．输电线上的电流减少了1/n倍 C．输电线上的电能损失减少了1/n2倍 D．输电线上的电能损失减少到原来的1/n2倍 |
答案：D
Americans value competition. They believe that competition out the best in any individual. They claim that it challenges or even each person to produce the very best that is humanly possible. , the foreign visitor will see competition encouraged in the American home and in the American classroom, at the youngest age levels. You may find the placed on competition confusing, especially if you come from a society that promotes cooperation competition among individuals. But Americans teaching in the Third World countries find the lack of competition in a classroom situation equally . They soon learn that what they had thought to be one of the universal human qualities only a particularly American or Western value.
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