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In order to solve the problem of producing large amounts of wastes and undesired o-nitrotoluene in synthesis of p-nitrotoluene with the mixed concentrated mineral acids,the catalytic activity of phosphotungstic acid for selective nitration of toluene was studied and the optimum conditions for preparing the catalyst were investigated.

为解决硝硫混酸对硝化甲苯过程中因甲苯的非选择性硝化产生的o-MNT和大量废酸对环境的危害，研究了磷钨酸对甲苯硝化反应的催化活性。

Four weeks later, the vein grafts were removed ,and HE staining, P/VB staining ,Ⅷ R:Ag staining, and Oil Red "O" staining were performed. Establish hypercholesterolemic rabbit model of vein grafting with PTFE external stent on one side and unexternal stent on the other side.

建立兔的高胆固醇血症模型并在其基础上行动静脉吻合，定期测量兔的血清总胆固醇(TC，4周后行VG的HE染色、VB染色、Ⅷ因子染色、油红&O&染色。

O Mom, today you are not to move a muscle.

i8 K6 {' P， D0 o 妈，今天您连动也不用动一下。

Na 2O-K 2O-CaO-MgO-Al 2O 3-SiO 2-P 2O 5 system glaze was studied systematically by perpendicular experiments in paper. We found the primary and secondary factors of effecting opacifying and glazing performance of the system,got the opacified glaze that had satisfactory performance ,and got fairly excellent formula of it.

本文对Na2 O -K2 O -CaO -MgO -Al2 O3 -SiO2 -P2 O5系统釉进行了较全面的正交试验研究，找到了影响该系统釉乳浊及釉面质量的主次因素，获得了性能良好的乳浊釉及其最佳乳浊釉配方。

Results: SC in Nei Zhang Wan groups and Vitamin E group advanced slower tban that in control group. The differences of the amount of SOD and MDA between Nei Zhang Wan groups and control group were significant ( P.05 ). The structures of epithelial cells and fibrocytes of lens in the Nei Zhang Wn groups were in good shape under transmission electron microscopy.

结果：中药组及维生素E组大鼠的白内障发生发展较模型组缓慢（P＜0.05），各观察组与对照组血清及晶状体的SOD、MDA含量比较有统计学意义什＜o.05h 透射电镜下形态学观察表明，中药组的晶状体上皮细胞及纤维细胞结构较模型组均匀、完整。

Results: fops had inhibitory effect on o 2 production in vitro, having a 50% of inhibitory concentration (ic50) of 3.866×10-6 g/ml, and a weak inhibitory effect on h2o2 production with a ic50 of l.668×10-3 g/ml but showed a potent inhibitory effect on the various free radicals produced by "respiratory burst" of human leukocyte. fops (20, 40, 80 mg/kg) increased the sod activity in myocardial tissue, liver and kidney of mice and decreased the mda content of myocardial tissue, liver, kidney and spleen of mice.

结果：在体外阿里红多糖可有效的清除o 2，其ic50为3.866×10-6；对h2o2的清除作用很弱，但能抑制人血嗜中性粒细胞&呼吸爆发&产生的多种自由基，ic50为1.668×10-3；阿里多红糖（20、40、80 mg/kg）可明显增加小鼠心脏和肝脏中sod的活性，其中剂量为40、80 mg/kg的阿里红多糖可明显增加肝脏中sod的活性，同时各给药组均可明显减少小鼠心脏、肝脏、肾脏和脾中mda的含量，与对照组相比较差异有统计学意义（p.05）。

Such textures suggest the development of reaction:① Gt〓+Cpx〓+Qz→Opx〓+Pl〓 and ② Gt〓+Cpx〓+Qz+H〓O→ Hb〓+Pl〓 Reaction ② is the first discovery in the granulite series in our country, the later cooling stage of M〓 was recognized by growth of yellowish green hornblende of amphibole facies at the expense of various pyroxenes.

在麻粒岩系中发现同一石榴石晶体边缘不同部位同时发生Gt+Cpx+Qz＝2Opx+pl和5Gt+5Qz+2H〓O＝2Hb+Pl等典型的降压反应，这一现象在国内麻粒岩系中也属首次发现。并通过这些特征变质反应实验资料的深入研究，确定了它们的平衡条件及所代表的P-T演化意义。

Determine (1)the angle acceleration of the tub wheel,(2) the tensile force of the rope,(3) the reaction forces at point O on the bearing,(4)the friction force between the cylinder and the inclined plane (neglecting the rolling friction).

在图示机构中，沿斜面向上作纯滚动的圆柱体和鼓轮O均为均质物体，各重为P和Q，半径均为R，绳子不可伸长，其质量不计，斜面倾角，如在鼓轮上作用一常力偶矩M。

Waving our red weapons o'er our heads- Shakespeare; The Red Badge of Courage; the red rules of tooth and claw- P.B.Sears.

在我们头上挥舞着我们的血染的武器——莎士比亚；红色勇气勋章；牙齿和爪子的血腥规则——p·b·西尔西。

We have obtained the hyperfine structure components of P(84) 5-5 transition with a SNR of 1000 at 1 s time constant. The diode laser is frequency stabilized to the hyperfine component o of the saturated absorption signal.

我们得到了此跃迁超精细结构成分的讯噪比是1000(在1秒的时间常数)；此二极体雷射稳频在o超精细结构成分上，所得到的频率稳定性优於10 kHz。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。