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A complete novel assumption is presented. Then, we prove the existence of two nontrivial solutions for a class of second order superlinear difference systems with the help of Minimax principle and Linking theorem in critical point theory,.6. Two applications in physics are given. Firstly, a coupled differential system coming from second harmonic waves is discussed.

利用Ricceri建立的三临界点定理，证明了一类含参数二阶差分方程在某些新的条件下至少存在三个解；随后，利用临界点理论中的极小极大原理和环绕定理，讨论了一类二阶超线性差分方程组多重解的存在性。

For the sake of making foreign students learn modal verb sooner and better, for the sake of increasing the efficiency of teaching Chinese as a second language and of furthermore mastering the Chinese, we analyze some common problems existed when foreign students are learning Chinese, sum up the patterns of error analysis and study the causes of forming the error, making several suggestions for teaching Chinese as a second language.This thesis is divided into seven chapters:Chapter one: Point out the motives and significance of selective subject, the scope of research and theory and method have been used in this thesis.

因此，为了使留学生更快更好地掌握汉语的能愿动词，为了提高对外汉语教学的效率，从而使留学生熟练地掌握汉语，我们从对外汉语教学的角度考察了外国留学生在学习汉语能愿动词时常常出现的一些问题，总结了偏误类型，探求了出现这些偏误的原因，进而提出了几点教学建议。

These modules are not interchangeable, be sure to replace the first check with a first check module and the second check with a second check module.

这些模块是不可互换的，请确保用第一止回阀模块更换第一止回阀，而用第二止回阀模块更换第二止回阀。

The experimental results of both setsof continua are similar: when compared with the monosyllable, the pho-neme boundaries between the second tone and the third tone of disyllableare shifted to the end of the second tone.

两组的实验结果一致：双音节第二和第三声的音位界线对比单音节的这一界线，都向第二声移动。

Now "The Moon Reflected in the Second Best Spring" already became one of "The Top ten Music of the World". More and more people from foreign countries than China have Wuxi and know the Second Best Spring under Heaven through this musical piece.

现在，"二泉映月"已经成为世界十大名曲之一，越来越多的国外友人正是因为这首曲子才知道中国无锡，了解天下第二泉。

The heavier bullet reduces muzzle velocity from 3,200 feet per second (975 m/s), to about 3,050 feet per second (930 m/s).

更重的弹头具有较少的初速，从早期型号的3，200码每秒（975米每秒）到A2的大概3050码每秒（930米每秒）。

Inverters 505 and 506 are coupled together in series between NAND gate 403 at VIN and a second input of multiplexer 510 to form a second delay path.

反相器505和506在NAND门403的VIN和乘法器510的第二输入端之间串联耦合到一起从而形成第二延迟路径。

At 11:00 on March 5 more than four people have access to Nathan Road, Bank of East Asia, the third and the fourth defendant to the staff of distraction, the first, the second defendant to enter the vault, the first defendant and hold up the second defendant to open the vault glass door locks.

3月5日上午11时多，4人先后进入弥敦道东亚银行，第三及第四被告向职员查询分散其注意力，首、次被告进入保险库，首被告并托起次被告以打开保险库玻璃门的锁。

The results showed that water content decreased first, then increased in the gastrula stage of embryonic development, reached the highest content at the second phrase larvae stage and then began to decrease from the third phase larva stage. The content of lipid in the dry weight increased with the embryonic development stages, but decreased at intramembranous nauplius stage, the second phase larva, and the infant stage of larvae development. The rate of lipid in wet weight decreased and the content of C20:4w6、20:5w3 and C22: 6w3 decreased.

结果显示，黑斑口虾蛄在胚胎和幼体的发育过程中，水的体积分数先降低，至原肠胚期开始升高，到第二相幼体期达到最高，之后又有所回落；脂类占组织干重的比率呈升高趋势，但分别在膜内无节幼体、第二相幼体和仔虾蛄期略有降低；脂类占组织湿重的比率呈降低趋势；花生四烯酸、EPA和DHA的体积分数都呈降低趋势。

Nb sp;If you overtake the second place person, and you take their place, you are second!

你如果追过第 2名，你只是取代那人的位置，你是第 2

Researches reveal that students who suffer from corporal punishment tend to resort to violence in their future life.

研究表明遭受过肉体惩罚的孩子倾向于在他们今后的人生中使用暴力。

Total sugar of sarcocarp and chlorophyll of pericarp increased firstly, and then decreased afterward along with altitude; Titratable acidity, ascorbicacid and anthocyanin of pericarp were increased along with altitude; The content of protein increased firstly and decreased afterward along with altitude; Carotenoid of pericarp were decreased along with altitude.

果肉总糖和果皮叶绿素含量随海拔高度升高先升高后降低；可滴定酸、维生素C和果皮花青苷含量均随海拔升高而升高；蛋白质在1720m处最大，1420m处最小；果皮类胡萝卜素随海拔升高而降低。