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2,2,5-三甲基-4,5-二乙基辛烷的结构简式为__________。
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要使加在负载L上的电压可由零逐渐加大,又可保护电源不致短路,则电路应为(??)
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如图所示,质量为l kg的铜块静止在水平面上,一颗质量为50 g的子弹以800 m/s的速度碰到铜块后,又以100 m/s的速度被弹回,若铜块与水平面间的动摩擦因数为0.25,求铜块被碰后在水平面上能滑行多远?
分别用l mol/L的AgNO3溶液完全沉淀NaCl、MgCl2、FeCl3三种溶液中的Cl-。(1)若NaCl、MgCl2、FeCl3三种溶液的物质的量浓度相同,体积也相同时,则依次消耗AgN03溶液的体积比为__________。(2)若用等体积的AgN03溶液分别去完全沉淀物质的量浓度相同的NaCl、MgCl2、FeCl3三种溶液中的Cl-时,这三种溶液的体积比为__________。
玻璃的折射率是1.5,水晶的折射率是1.55,光线从空气分别垂直射入玻璃砖和水晶砖,通过它们所用的时间相同,若玻璃砖厚度是3.1cm.则水晶砖厚度是(??)
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两个分子问的距离由大于l0-9m逐渐减小直到不能再减小,关于这一过程中,两个分子间分子力的变化情况,下面正确的是( )
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22. Chess must be one of the oldest games in the world. An Arab traveler in India in the year 900 wrote that it was played "long, long ago". Chess was probably invented in India, and it has been played everywhere from Japan to Europe since 1400. The name "chess" is interesting. When one player is attacking the other's king, he says, in English,"check". When the king has been caught and cannot move anywhere, he says "check mate". These words come from Persian. "Shah mat" means "the king is dead". That is when the game is over, and one player has won.Such an old game changes very slowly. The rules have not always been the same as they are now. For example, at one time the queen could only move one square at a time. Now she is the strongest piece on the board. It would be interesting to know why this has happened! Chess takes time and thought, but it is game for all kinds of people. You don't have to be a champion in order to enjoy it. It is not always played by two people sitting at the same table. The first time the Americans beat the Russians was in a match played by radio. Some of the chess masters are able to play many people at the same time. The record was when one man played 400 games! It is said that some people play chess by post. This must make chess the slowest game in the world.(10分)22.1 Which of the following is known to be true?____(2分)A. Chess is an old Indian traveling game.B. Chess is the oldest game in the world.C. Chess was played in Japan and Europe before 1400.D. Chess was played in India long before 900.
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