四

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Then we prove the one-to-one corresponding relation between 3-coloring of inducing four regular graph and 4-coloring of maximal planar graph and find out the relation between three colors of inducing four regular graph and three dual bi-chromatic subgraph of maximal planar graph.

本文给出了极大平面图的导出四正则图的两种构造方式、等价性及性质，证明了导出四正则图的三着色与原极大平面图四着色的一一对应关系，并且找出了导出四正则图的三种颜色与原极大平面图四着色的三组对偶二色子图之间的关系。

The reason why quaternion is used in flight simulation of fighter aircraft and the geometric meaning of quaternion are described,according to axis system used in flight simulation of fighter aircraft in China,three problems are introduced as follows:(1) quaternion kinematic equations,(2) relationship of quaternion and coordinate transformation matrix,(3) Euler angles in terms of quaternion.

阐述了在战斗机的飞行仿真中采用四元数的原因和四元数的几何意义，并按照中国战斗机飞行仿真中采用的坐标系，介绍了三个问题：四元数运动学方程；四元数与坐标变换矩阵的关系；用四元数表示的欧拉角。

The Fourth Medicine came into being with the health revolution, the fourth great revolution. In the development history of human beings, each scientific and technical revolution has greatly influenced people's life: the Agricultural Revolution has put an end to the dog-eat-dog age and solved the problem of food and clothing; the Industrial Revolution has greatly improved the efficiency, making people enjoy a comfortable life while work for a shorter time and the Information Revolution has shortened the time and space, providing more leisure time for people. At present, people are faced with the health revolution, aiming to make people have a pleasant, healthy, longevous and high-quality life. To meet that end, the fourth medical workers need to make great efforts. The Fourth Medicine contains scraping and cupping therapy, stone needle therapy, massotherapy, foot massage, body beauty, psychology, physiotherapy, reasonable movement and food therapy, etc.

第四医学的形成是在人类的第四次大革命健康革命启发下而诞生的在人类历史的发展中，每次科学技术革命，无不给人类的社会生活带来巨大影响，农业革命使人们不必自相残杀，弱肉强食，人人可以温饱地生活；工业革命使劳动效率大大提高，使人们在短时间的劳作就可以安逸舒适的生活；信息革命又使时空缩短，大大提高了劳动生产率，使人们的休闲时间大大超过了劳作时间当前所面临的是人类的第四次大革命健康革命它的目标使人们愉快健康长寿，高质量地渡过幸福的一生要想达到这一目标就需要第四医学工作者来完成第四医学包含了刮痧拔罐疗法砭石疗法按摩疗法足疗美容心理学理疗合理运动食疗等

As the preferentially recommended odorant of the new generation, THT took the place of ethanethiol as the odorant for nature gas by Beijing Natural Gas company in 1996. Due to the relatively short history and low production level of THT in China, little research has been done on it.

四氢噻吩作为在国际上被推荐首选使用的新一代燃气加臭剂，北京市天然气公司于1996年将天然气中的加臭剂由乙硫醇改为四氢噻吩，但中国由于采用四氢噻吩的时间比较晚，且因为四氢噻吩的生产在国内比较少，所以针对四氢噻吩的研究比较缺乏。

Major procurement of goods: a three-chlorosilanes, dichloromethane, AE activity ester, 3-iodine Silane, special acid, pentyl chloride, triethylamine, thiadiazole, tetrazolylazo acid, 2 - Acetamide, tetrahydrofuran, the four-guanidine, isopropanol, five phosphorus trichloride, sodium vary bitter, acid, sodium phenylacetate, 6-2 silicon n-amine, Ethylacetoacetate , Methyl isobutyl ketone, potassium dihydrogen phosphate, aluminium oxide, DL methionine, N, N-dimethylaniline, NN-diethyl aniline, 4 sodium EDTA, Anhydrous sodium sulfate, ammonium sulfate, potassium sulfate, sodium acetate, sodium carbonate, DMC, formic acid, sodium chloride medicinal, oxalate, protopine, acetone, alcohol, acetic acid, vinegar Ethyl, butyl acetate, methanol, ethanol (anhydrous, industrial, medicinal), formaldehyde, Ye Jian (30%), hydrochloride (industrial-grade, refined grade, reagent level), sulfate (98%), Ammonia, calcium carbonate, chlorine dioxide, 6 - APA ,7-ACA ,7-ADCA ,7-ANCA, sulbactam, ceftazidime activity ester, Deng salt (hydroxymethyl-K, acid precursors Potassium, sodium dihydrogen methyl), resin, the enzyme, water treatment agent, Xiao Mo agent, demulsifier, flocculants, activated carbon, all kinds of medicinal materials, All kinds of additives

三甲基一氯硅烷、二氯甲烷、AE活性酯、三甲基碘硅烷、特戊酸、特戊酰氯、三乙胺、噻二唑、四氮唑乙酸、二甲基乙酰胺、四氢呋喃、四甲基胍、异丙醇、五氯化磷、异辛酸钠、苯乙酸、苯乙酸钠、六甲基二硅胺烷、乙酰乙酸乙酯、甲基异丁酮、磷酸二氢钾、三氧化二铝、DL蛋氨酸、N，N-二甲基苯胺、NN-二乙基苯胺、乙二胺四乙酸四钠、无水硫酸钠、硫酸铵、硫酸钾、醋酸钠、碳酸钠、碳酸二甲酯、甲酸、药用氯化钠、草酸、片碱、丙酮、正丁醇、冰醋酸、醋酸乙酯、醋酸丁酯、甲醇、乙醇、甲醛、液碱（30％）、盐酸（工业级、精制级、试剂级）、硫酸（98％）、氨水、碳酸钙、二氧化氯、6－APA、7－ACA、7－ADCA 、7－ANCA、舒巴坦、头孢他啶活性酯、邓盐(羟甲基钾、前体酸钾、二氢甲基钠)、树脂、生物酶、水处理剂、消沫剂、破乳剂、絮凝剂、活性碳、各种药用辅料、各种添加剂

Existing production equipment: Germany MAN Roland 700 four large off-color machine, Heidelberg four - 102 big four off-color machine, four-opened two-color, four-color offset printing press; seven-color gravure printing machine, fully automatic mode in Taiwan cutting machine, tipping machine, folder gluer, stickers mounted liquid light-controlled cutter, laminating machine, tile blank machine, binding machine, proofer; pre-press plate making, such as Apple Computer.

现有生产设备：德国曼罗兰700型大对开四色机，海德堡四--102大对开四色机，四开双色、四色胶印机；七色凹印机、台湾全自动模切机、烫金机、糊盒机、贴裱液轻控切纸机、复膜机、瓦愣机、装订机、打样机；印前苹果电脑制版等。

The rest denote sound break down, it be called rest and shown as '0' in the music book. Rest can be disport as note full-rest, half-rest quarter rest, eight rest and sixteen rest.

二分之二拍 2/2 2/2 beat 四分子二拍 2/4 2/4 beat 四分之三拍 3/4 3/4 beat 四分之四拍 4/4 4/4 beat 八分之三拍 3/8 3/8 beat 八分之六拍 6/8 6/8 beat 八分之十二拍 12/8 12/8 beat 三、休止符rest 表示声音停顿的符号，叫休止符，用"0"来表示休止符和音符一样可分为：全休止符，二分休止符，四分休止符，八分休止符和十六分休止符。

The company has more than 2000 square meters of factory buildings, over 300 employees, has advanced four open four-color Heidelberg, Roland quarto four-color, Heidelberg opened four monochrome, trademark machine, a new plate, automatic red version machine, full-color printing computer paper cutting machine production equipment; and supporting post-processing equipment.

公司拥有2000多平方米的厂房，员工300余人，拥有先进的海德堡四开四色、罗兰四开四色、海德堡四开单色、商标机、全新的晒版机、自动冲版机、全电脑切机纸等彩印生产设备；及配套后加工设备。

Tetrachloroterephthalic acid was prepared by chlorinating terephthalic acid, oleumsolvent and iodine catalyst. Tetrachloroterephthalic acid was acylated by sulphurous oxychloride in the presence of DMF to form tetrachloroterephthaloyl chloride. The acyl chloride product was fluorinated by potassium fluoride and esterified by methanol to synthesize dimethyl tetrafluoroterephthalate. The ester was reduced with potassium borohydride and lithium chloride to give tetrafluoroterephthalyl alcohol. The above product was bromated in the hydrobromic acid to obtain 4-bromomethyl-2,3,5,6-tetrafluoro-benzene methanol. 4-Methyl-2,3,5,-6-tetrafluorobenzene ethanol was obtained by reducing the bromide with magnesium. In the exist of DCC and DMAP, tefluthrin was got by the condensation reaction between 4-methyl-2,3,5,6-tetrafluoro-benzene methanol and-(1RS,3RS)- 3-(2- chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cycolpropanecar-boxylate acid.

对苯二甲酸与氯气在碘存在下以发烟硫酸为溶剂进行氯化制备四氯对苯二甲酸；再以DMF为催化剂与二氯亚砜反应生成四氯对苯二甲酰氯；以氟化钾为氟化剂，环丁砜为溶剂置换氟化，再与甲醇酯化得到四氟对苯二甲酸甲酯；以KBH4-LiCl为还原剂二甲醚为溶剂反应制得四氟对苯二甲基苄醇；以氯苯为溶剂在溴化氢溶液中溴化得到溴化产物；在乙醇溶液中经镁粉还原得到4-甲基-2，3，5，6-四氟苄醇；甲基苄醇与功夫酸在催化剂二环己基碳二亚胺和4-二甲氨基吡啶作用下缩合得到七氟菊酯，总收率达43.6%。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。