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Results show that detonation velocity of compound explosive declines from 3100 m·s-1 to 2100 m·s-1 when mass ratio of attenuant rises from 20% to 60%(explosive loading thickness is 30 mm ),and the density of compound explosive rises from 0.615 g·cm-3 to 0.76 g·cm-3 when mass ratio of attenuant rises from 20% to 50%.

结果显示，当稀释剂含量从20%增加到60%时，混合炸药的爆速(药厚：30 mm)由3100 m·s-1降到2100 m·s-1，炸药的密度也由0.615 g·cm-3增加到0.76 g·cm-3(稀释剂含量： 20%~50%)；稀释剂含量为50%的混合炸药，当药厚在25~50 mm范围内时，爆速保持在2300~2360 m·s-1之间。

Compared to wet season, arsenic is difficult to mobile in dry season. Attenuation constant in dry season is 0.3082(1/km), but it is 0.0569(1/km)in wet season. If initial concentration of As was 500μg/L without other contamination source in down stream, arsenic would deceased to 50μg/L in down stream 7.5km in dry season but 40km in down stream 40km. As is dominate species in river running throμgh mining area.

砷在枯水期较丰水期难以迁移，通过计算得到，在枯水期砷的衰减系数K值为0.3082(1/km)，而在丰水期为0.0569(1/km)；在污染口浓度达到500μg/L时，下游没有其它的砷的污染源(或会影响砷衰减的其它污染源)时，枯水期砷会在下游7.5km之后浓度降到50μg/L，而丰水期则要在下游40km之后才能降到同样的值，所以在丰水期砷污染的影响的流域更广。

C. gigantea is a high biomass, fast growing perennial shrub growing as a weed in the Hainan province of China. It was used as a traditional folk medicine for the treatment of cough, leprosy, and asthma by the people of Li nationality, who are autochthon of Hainan island of China. In our screening for bioactive agents from tropical medicinal plants, the ethanol extract of the roots of C. gigantea showed cytotoxic activity towards human chronic myelogenous leukemia (K562) and human gastric cancer (SGC-7901) cell lines in vitro by MTT method with IC50 values of 9.7 μg/mL and 6.7 μg/mL, respectively.

为了开发热带药用植物资源，从中寻找具有药用价值的生物活性成分，本文采用MTT法对牛角瓜乙醇提取物进行体外活性筛选，结果表明其对K562 及SGC-7901 具有细胞毒活性，IC50值分别为9.7 μg/mL 和 6.7 μg/mL。

Let G be a soluble block-transitive automorphism group of 2-(56,7,1) design D.

设G是设计2-(5~6，7，1)的一个可解区传递自同构群，则G是旗传递的且G■A■L(1，5~6)。

G is called point-transitive if it has a point-transitive automorphism group. Let PM denote the perfect matching polytope of the graph G.

称G是顶点可传递的，如果其自同构群是顶点传递的。G的完美匹配多面体记作PM。

The values of AFC50(media antifeeding concentration)at 24h on the 3rd instar larvae of Ostrinia furnacalis was 3408.31μg/ml, according to 2275.22μg/ml of media azedarach.

结果表明：蟛蜞菊4个不同部位中，以花的甲醇提取物拒食效果最好，24h对亚洲玉米螟3龄幼虫的AFC50为3392.28μg/ml，对照印楝为2228.72μg/ml。

The relative standard deviation was within 6.2%. The contents of benzene series in sediments were betw een 3.79 and 17.36 μg/g.

测得海洋沉积物中的这些苯系物的质量比范围为3.79～17.36 μg/g。

The recovery rate of added water samples was from 85% to 115%. The range of the lowest detection limit was 0.08-0.21 μg/L. The correlation coefficient was more than 0.999 4. The relative standard deviations (n=6) were generally lower than 8.0% for 2 μg/L standard solution of benzene series through 6 repetitions of determination.

结果表明，水样的加标回收率在85%～115%，最低检测限在0.08～0.21 μg/L，相关系数大于0.999 4，浓度2 μg/L的苯系物标准溶液经重复6次测定，其相对标准偏差基本小于8.0%。

E〓 is a perfect matching of G and G·E〓 is a bipartite graph.

2E〓是G的一个完美匹配，并且G·E〓是一个偶图。

The bromoform concentration of 16.4 μg/l measured after 80 min contact time was reduced to 1.6 μg /l by GAC filtration with an empty bed contact time of 4.2 min.

接触80分钟后测出的16.4μg/l的溴仿浓度经过4.2分钟空床停留时间的活性炭过滤已降至1.6μg/l。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。