题目内容
直流电动机的电磁转矩在电动状态时是驱动性质的转矩，当增大电磁转矩电动机的转速将会上升。
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直流电机中，换向极的作用是改变换向，所以只要装置换向极都能起到改向的作用。
The justification for a university is that it preserves the connection between knowledge and the zest of life, by___1____ the young and the old in the imaginative consideration of learning. The university imparts information, but it imparts it imaginatively. At least, this is the____2___which it should perform for society. A university which fails in this respect has no reason for ___3____ .
This atmosphere of excitement, arising from imaginative consideration, transforms knowledge. A fact is no longer a bare fact: it is__1____ all its possibilities. It is no longer a burden on the memory: it is energising as the poet of our dreams, and as the architect of our purposes. Imagination is not to be __2____ the facts: it is a way of illuminating the facts.
It works by drawing the general principles which ___1____ the facts, as they exist, and then by an intellectual survey of alternative possibilities which are ____2___ those principles. It enables men to construct an intellectual vision of a new world, and it preserves the zest of life by the suggestion of satisfying purposes. Youth is imaginative, and if the imagination be ___3____ by discipline this energy of imagination can in great measure be preserved through life.
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