更多"hypoglossal nucleus"的相关试题:
[填空题]A nuclear fission is a process of a U-235 nucleus with a neutron trying to capture another neutron.
[单项选择]Nuclear fission is the splitting of the nucleus of an atom. Only a few elements are suitable for use in this way, the most important ones being Uranium-235, Uranium-233, and Plutonium-239. When a nucleus of one of these elements is struck by a free neutron it breaks down into two lighter nuclei which fly apart at high speed, colliding with surrounding atoms. Their kinetic energy is converted into heat energy. At the same time, two or three free neutrons are released and one of them enters the nucleus of a neighbouring atom, causing fission to occur again; and so on. The reaction spreads very quickly, with more and more heat energy released. This is called a "chain" reaction because the splitting of each nucleus is linked to another, and another and another.
If this reaction takes place in an atomic bomb, where nothing is done to slow it down, the result is a violent explosion that can destroy a town in a few seconds. Fission can also, however, take place within a construction call
A. Nuclear Fusion
B. The Nuclear Fission Chain Reaction
C. Uncontrolled and Moderated Nuclear Reactions
D. The Advantages of Nuclear Energy
[填空题]A. the nucleus of a cell
B. cloned human beings
C. a human being in two years
D. a law to ban human cloning
E. a report on human cloning
F. heavy media coverage
Richard Seed claimed to be able to clone ______.
