下标

The EMPA results indicate that the main chemical compositions of the "Lvlongjing" sampe are SiO2 and MgO, followed by Al2O3 and FeO, and the chemical formula is calculated and projected to be in the area of penninite according to Fe(superscript 2+)/R(superscript 2+) and atomicity of Si.

电子探针结果表明，该&绿龙晶&样品的主要化学成分为SiO2和MgO，其次为Al2O3和FeO；计算其晶体化学式并根据Fe(上标 2+)/R(下标 2+)和Si的原子数量进行投影，恰好落于叶绿泥石的区域范围。

Pentaerythrityl tetraacetate was synthesized from acetic acid and pentaerythrite, catalyzed by SO(superscript 2- subscript 4)/TiO2-La2O3 rare-earth solid superacid. Various factors affecting the reaction were discussed.

以稀土固体超强酸SO(上标 2-下标 4)/TiO2-La2O3为催化剂，乙酸和季戊四醇为原料合成季戊四醇四乙酸酯，并考察了影响反应的因素。

SO(superscript 2- subscript 4)-TiO2/γ-Al2O3 solid superacid catalyst has good catalytic activity in the synthesis of other acetals.

SO(上标 2-下标 4)-TiO2/γ-Al2O3新型固体超强酸催化剂在其它缩醛的合成中也具有良好的催化活性。

In this paper, the dissents in groundwater analytical data from a ministerial professional laboratory during 1991 to 2000 were summarized. The factors resulting in the dissents, their characteristics and causes, as well as prevention measures were discussed. During the 10 years, dissents of 12 parameters including H2SiO3, Sr, NO2(superscript -), I(superscript -), SO(superscript 2- subscript 4) and etc. were found and most of the parameters are very important in research of hydrogeology, hydro-geochemistry, groundwater environment and groundwater exploration.

通过对国土资源部某专业实验测试中心10年质量异议资料的分析，总结了地下水水质检测中容易产生质量异议的检测参数，分析了这些参数的特点，探讨了质量异议产生的原因和预防措施。1991~2000年间该实验室共有H2SiO3、Sr、NO2、I、SO(上标 2-下标 4)等12项检测参数出现质量异议，大多为水文地质、水文地球化学、地下水环境质量研究和地下水开发利用所关心的关键参数。

OBJECTIVE To study the effects of aloe-emodin and emodin on scavenging superoxide anion free radical O(superscript – subscript 2 and hydroxy free radical.

目的：研究芦荟大黄素和芦荟素对超氧阴离子自由基O(上标–下标 2、羟自由基的清除作用。

Aloe-emodin and emodin have strong clearing function on O(superscript – subscript 2) and OH, and the clearance is obviously related to the concentration.

芦荟大黄素、芦荟素对O(上标–下标 2)、OH均有较强清除能力，且清除能力与浓度呈明显的量效关系。

Br(superscript -) and NO3(superscript -) have a stronger inhibitory effect on the photolytic decoloration of direct sky blue than SO(superscript 2- subscript 4), NO2(superscript -) and Cl(superscript -). The coexistence of two different anions has a synergistic inhibition effect on the photolysis decoloration.

与SO(上标 2-下标 4)、NO2、Cl相比BR和NO3对脱色作用抑制最显著，而且两者能形成协同作用抑制光解脱色。

Fe2O3/SO(superscript 2- subscript 4) solid super acid was obtained by dissolving iron nitrate in ammonia, dipping the resultant iron hydroxide in sulfuric acid, filtration and calcination.

硝酸铁溶于氨水得到Fe3后再用硫酸浸泡，经过滤、焙烧制得固体超强酸催化剂Fe2O3/SO(上标 2-下标 4)。

The correlation coefficients between 0X, 1X, 0X(superscript ' subscript D), 1X(superscript ' subscript D) and boiling points for 80 alkenes, 39 alkynes and 169 aliphatic unsaturated hydrocarbons were made, which were 0, 999 3, 0, 999 6, 0. 995 5, respectively and better than those of the famous Kiers index (superscript mX.

其逆指数0阶、1阶指数0X(下标 D，1X，0X，1X分别与80个单烯烃、39个单炔烃、169个不饱和烃的沸点进行相关，复相关系数依次为0.9993，0.9996，0.9955，均优于著名Kier指数(上标 mX的回归结果。

Through environment scanning electron microscope and X-ray energy-dispersive spectrometer the results indicate that the major mineral of the samples is Si-rich sericite, whose monocrystal is of being well, leaf-shaped and orientational arrangement, with its aggregate being imbricate characteristics. The average chemical formula of Si-rich sericite in the sample is K0.59Na0.50{Al2.86Mg0.50Fe(superscript 3+ subscript 0.754.11[Al0.91Si7.09]8O204

环境扫描电子显微镜及其能谱仪的测量结果显示，歙砚样品的主要矿物为多硅白云母，其单晶颗粒好，呈叶片状、定向排列，其集合体呈叠瓦状结构分布；其平均化学式为K0.59Na0.50{Al2.86Mg0.50Fe(上标 3+下标 0.754.11[(Al0.91Si7.09)8O20]4}。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失