题目内容
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A、低活度核素 Low activity nuclides
B、短半衰期核素 Short half-life nuclides
C、高活度核素 High activity nuclides
D、长寿命核素 Long half-life nuclides
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更多“临床放射诊疗使用的是 What kind of radion…”相关的问题
第1题
A、低活度核素 Radionuclides of low radioactivity
B、短半衰期核素 Radionuclides of short half-life
C、大原子序数核素 Radionuclides of large atomic number
D、长寿命核素 Radionuclides of long half-life
第2题
A、单位体积内放射性核素的数目 Number of radionuclides per unit volume
B、单位时间内发生核衰变的次数 Number of radionuclide decay per unit time
C、单位时间内核衰变释放的能量 Energy released by radionuclide decay per unit time
D、核素半衰期的2倍 2 times the half-life of the radionuclide
E、放射性核素半衰期 Half-life of radionuclides
第3题
B.error classification
C.error description
D.error explanation
第4题
A、Arrows symbols and line symbols.
B、Mathematical symbols.
C、Chemical symbols.
D、Punctuation marks.
第5题
A、Sports shoes.
B、Sneakers.
C、Black leather shoes.
D、White leather shoes.
第7题
This is how the new machines work. A machine【24】placed in an area far away from the person who controls it. The person wears a special hard bat with tiny television screens. The screens【25】the person see and hear exactly what the machine is【26】and hearing. This gives the person the feeling of being in the same place【27】the machine. The person controls the machine. The machine【28】the person's movements exactly. If the person raises his right arm, the machine raises the right arm, too. This means an【29】worker can do a dangerous job while【30】in a safe place. For example, a person can direct the machine【31】a bomb【32】going near the bomb himself.
The new machines are not exactly【33】robots. Robots are controlled by a computer. The new machines are controlled【34】a person. The new machines are called teleoperators. The nuclear power industry is especially interested in teleoperators. The machines could solve the problem of【35】radioactive materials.
(41)
A．is developing
B．has developed
C．develops
D．is being developed
第8题
B. Ten to twenty multiple-choice questions
C. All of the above
D. Two or three open-ended questions
第9题
An atom consists of a tiny core called the "nucleus" with attendant electrons circling round it. The hydrogen atom, which is the simplest and lightest, has only one electron. Heavier atoms have more and more as they go up the scale. The first discovery that had to do with what goes on in nuclei was radioactivity, which is caused by particles being shot out of the nucleus. It was known that a great deal of energy is locked up in the nucleus, but, until just before the outbreak of the Second World War, there was no way of releasing this energy in any large quantity. A revolutionary discovery was that, in certain circumstances, mass can be transformed into energy in accordance with Einstein's formula which states that the energy generated is equal to the mass lost multiplied by the square of the velocity of light.
The A-bomb, however, used a different process, depending upon radioactivity. In this process, called "fission", a heavier atom splits into two lighter atoms. In general, in radioactive substances this fission proceeds at a constant rate which is slow where substances occurring in nature are concerned. But there is one form. of uranium called "U235" which, when it is pure, sets up a chain reaction which spreads like fire, though with enormously greater rapidity. It is this substance which was used in making the atom bomb.
The political background of the atomic scientists' work was the determination to defeat the Nazis. It was held--I think rightly--that a Nazi victory would be an appalling disaster. It was also held, in Western countries, that German scientists must be well advanced towards making an A-bomb, and that if they succeeded before the West did they would probably win the war. When the war was over, it was discovered, to the complete astonishment of both American and British scientists, that the Germans were nowhere near success, and as everybody knows, the Germans were defeated before any nuclear weapons had been made. But I do not think that nuclear scientists of the West can be blamed for thinking the work urgent and necessary. Even Einstein favored it.
When, however, the German war was finished, the great majority of those scientists who had collaborated towards making the A-bomb considered that it should not be used against the Japanese, who were already on the verge of defeat and, in any case, did not constitute such a menace to the world as Hitler. Many of them made urgent representations to the American Government advocating that, instead of using the bomb as a weapon of war, they should after a public announcement, explode it in a desert, and that future control of nuclear energy should be placed in the hands of an international authority. Seven of the most eminent of nuclear scientists drew up what is known as "The Franck Report" which they presented to the Secretary of War in June 1945. This is a very admirable and far-seeing document, and if it had won the assent of the politicians, none of our subsequent terrors would have arisen.
We may infer that the writer's attitude towards the A-bomb is that ______.
A．it is a necessary evil
B．it is a terrible threat to the whole of mankind
C．it played a vital part in defeating the Japanese
D．it was a wonderful invention
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