题目内容
压电晶体表面所产生的电荷密度与。
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压电元件受力的方向与产生电荷的极性。
Whatever pressures there can be or inferences one can make, people become what they do, though it may not be in compliance(符合) with their true desires. Therefore, we should all bear in mind Kurt Vonnegut’s advice: “We are what we pretend to be, so we must be careful about what we pretend to be.”What does the author mainly discuss in the passage?
All over the world, researchers are racing against the clock to figure out how best to feed more people in a fast-changing world. 2.And some surprising ideas have begun to come up. 3.Two years ago, scientists introduced the first burger made from meat grown in a lab. 4.The project cost more than $300, 000, but it is a start. 5.Other researchers are developing seeds that can survive high temperatures and drought. 6.Still others are finding ways to improve the genes ofmeat animals so they produce more meat and can stand the heat.Which sentence is the main idea of this paragraph
1、If you hadn’t known them, you would have thought Joe and Jim were quite alike. 2、They were both tall and wore long and fair hair. 3、They both spoke in a deep voice that made themselves seem much older than they really were. 4、Both of them wore dark clothes as a rule, and they liked light colored ties. 5、But that was all the likeness they had. In other things they were sharply different. 6、Joe was considerate and helpful, and everyone liked him. 7Jim, however, was very selfish and often burst into terrible anger at little things that displeased him. 8、Alike as Joe and Jim were on the surface, they were really very different in nature.Which sentence is the main idea of this paragraph?
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