难解的

In architectonics, the calculation of rectangular plate on elastic foundation, in common, is used by the finite element method and chart .

在建筑结构设计中的局部均布荷载作用下非均匀弹性地基上矩形板的计算一般采用有限元法和图表，在理论上很难获得一般性的解析解。

The glycemic index, physiological function of low glycemic-index food and low glycemic-index starchy derivatives (including indigestible dextrin, slowly digestible starch, resistant-enzyme starch, starch-lipid complex and starch-protein conjugate) are introduced.

本文综述了近年来低血糖生成指数淀粉类衍生物的研究进展，并简要介绍了国内外对血糖生成指数、低血糖生成指数食品的生理学功能及其淀粉类衍生物(如难消化糊精、慢消化淀粉、抗酶解淀粉、淀粉-脂质复合物、淀粉-蛋白质复合物等)方面的基本研究状况，展望了其发展前景。

Because of the multimodal of the solution of the inverse problem, traditional deterministic optimization algorithm is often useless to solve this kind of problems.

由于逆问题的解具有多峰值性，传统的确定类优化算法很难实现逆问题的求解。

Hydrogenation of N=O group is easier than hydrogenolysis of the C-Cl bond on the hydrogenation of chloronitrobenzene .

氯代硝基苯中N=O极性键的加氢较C-Cl键的氢解容易进行，肉桂醛中C=O极性键较C=C键的加氢难。

The standard solubility product and solubility of compound salt ammonium molybdate· molybdenum trioxide at 0~100 ℃ condition are studied.

研究了难溶复盐钼酸铵氧化钼的标准溶度积常数和不同温度下的溶解度，测定了同离子效应对溶解度的影响，并用红外光谱分析了其解离形式。

The perfect cleavage of spodumene makes it considerably more difficult to facet, and a little more care is necessary to prevent damage when wearing a spodumene gem set in a ring.

锂辉石的解理完全，因容易裂阙，很难加以切割。但也正因如此，佩带一些锂辉石的戒指不易遭受一些损坏。锂辉石通常适合做一些吊咀、胸针和耳环。

Analytical results showed that the upper clear liquid of pyrolysis oils was mainly consisted of water-soluble substances,such as phenol,cresol,xylenol,sugars,hydantoins,morpholines,pyranones and pyridine derivatives compounds,etc.,while the lower sediment was mainly insoluble or hardly water-soluble substances,such as the big substituent phenolics(the number of substituent carbon atoms of which is greater than or equal to 2),aryl phosphate esters,fatty acid esters and nitrile compounds,and so on.

研究表明，热解油上层清液主要是一些较易溶于水的物质，如苯酚、甲酚、二甲酚、糖类、乙内酰脲类、吗啉类、吡喃酮类和吡啶类化合物等；而下层沉淀则主要为不溶或难溶于水的物质，如大取代基酚类（取代基碳原子数≥2）、磷酸三芳基酯类、脂肪酸酯类和腈类化合物等。

The results showed that inoculated PSB can improve plant growth and promote plants uptake and utilize more undissolving P. It also decrease pH of the medium and increase microbe population.

研究表明，加入解磷细菌后，对粉煤灰基质有一定的改良作用，促进了植物生长，增加了对粉煤灰中难溶性磷的吸收利用，降低了粉煤灰pH，增加了根际细菌和真菌的数量。

Applying analytical method,the exact transfer matrix of circular arches with constant cross_section is derived.

由于结构本身的复杂性，对于变截面圆拱的自由振动很难获得解析解。

It's photo catalytic degradation efficiency is mainly related to light quantum efficiency.

TiO2 半导体作为光催化剂降解难降解有机污染物有其独特的优势，它的光解效率与光量子效率有很大的关系。

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。