若$a,b,c$为△ABC的三边，且${\left(a^2-b^2\right)}^2+4a^2{b}^2-c^4>0$，则△ABC的形状不可能是（   ）．

下列工业中，属于动力指向型工业的是（   ）

阅读理解

    If you like shopping and you are crazy about fashion, London is a good place for you. In London you can buy not only the most expensive clothes, but also beautiful clothes which are inexpensive.

    Many of the world's most famous fashion designers have their own shops in London. And every year in February and September, there is an important fashion event. It is called London Fashion Week and people all over the world come here and enjoy England's wonderful new clothes. Usually the clothes are sold at a high price. The clothes are always in style. In the 1960s, a fashion designer Mary Quant invented the miniskirt. It made her famous all around the world. Later, in the 1970s, came "punk" fashion.

    Outside London there are some shopping centres as well. In the shopping streets of most towns have a Market Day. On that day, some of the streets are filled with stalls selling food, flowers, dressess, hats & bags, and many other different things. The clothes there are always at a low price. Nearly everybody can afford them.

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