Albert Einstein, the author of the Theory of Relativity, made a ________ contribution to physics in the twentieth century.

单选题

Albert Einstein, the author of the Theory of Relativity, made a ________ contribution to physics in the twentieth century.

答案解析

单选题

A young man asked Albert Einstein, the great German scientist, what the secret of success was. The scientist told him that the secret of success was hard work. A few days later, the young man asked the same question again. Einstein was very annoyed. He did not say anything, but wrote a few words on a piece of paper. On it was written: A=X+Y+Z. “What does this mean? asked the young man. “A means success”, explained the old scientist. “X stands for hard work, Y for good method and Z. Z means stop

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单选题

We naturally _____ Einstein with the Theory of Relativity.

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单选题

Einstein’s theory of relativity seemed hard to believe at the time _____.

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材料题

ecting a beam of light to a mirror located kilometers away and placed a rotating cogwheel（旋转齿轮）between the beam and the mirror. From the rate of rotation of the wheel,number of wheels teeth and distance of the mirror,he was able to calculate that the speed of light is 313 million meters per second. In a vacuum（真空）,however,the speed of light is 299,792,458 meters per second. This is about a million times faster than the speed of an airplane.Objects are visible to the human eye as light is______.

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