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The results showed that the optimal conditions for synthesis of benzyl acetate were: the molar ratio of acetic acid to benzyl alcohol was 2∶1,the amount of the water carrier was 40%,the amount of the catalyst was 3.5%,and reaction time was 6 h.

结果表明，乙酸苄酯最适宜的合成工艺条件为：酸醇摩尔比2∶1、催化剂用量3.5%、带水剂用量40%、反应时间6 h。

"Feedback inhibition:A cellular control mechanism in which an enzyme that catalyzes the production of a particular substance in the cell is inhibited when that substance has accumulated to a certain level, thereby balancing the amount provided with the amount needed."

&反馈抑制：当某生化反应系列的末端产物到达某一固定的水平时，该末端产物对控制该系列生化反应早期阶段的某个酶产生了抑制作用，从而平衡供给和需求量。&

"Feedback inhibit ion:A cellular control mechanism in which an enzyme that catalyzes the production of a particular substance in the cell is inhibit ed when that substance has accumulated to a certain level, thereby balancing the amount provided with the amount needed."

&反馈抑制：当某生化反应系列的末端产物到达某一固定的水平时，该末端产物对控制该系列生化反应早期阶段的某个酶产生了抑制作用，从而平衡供给和需求量。&

Chemically pure elemental Al and CuO powder with an Al mass percentage of 20, 35, 57, 70 and 85 were milled respectively. The ball milled powders were analyzed by X-ray diffractometry and differential scanning calorimetry. When the amount of Al was under 20%, the reduction occurred only. When the amount of Al exceeded 20%, besides reduction, the synthesis reaction occurred simultaneously.

对Al含量在20%～85%范围内的Al/CuO进行高能球磨，采用X射线衍射进行物相分析，并对Al含量分别为20%和75%的试验分析了物相随研磨时间的变化，做了差示扫描量热分析，对比研究了固态还原反应与固态复合反应过程的异同。

Producing high purity chlorine dioxide by hydrogen peroxide method,several stabilize which can reduce the decomposition of hydrogen peroxide were studied DTPMP、PBTCA、HEDP are certained as the ideal stabilizer and the optimum amount of these three stabilizer are 0.6%,1.0%,0.6% of hydrogen peroxide amount respectively.

摘 要：采用过氧化氢法制备高纯度二氧化氯，研究了几种抑制过氧化氢分解的稳定剂。确定了DTPMP、PBTCA、HEDP三种稳定剂效果较理想，其最佳用量分别为反应液中过氧化氢质量分数的0.6%、1.0%、0.6%。

Medium added inhibitor, could slow down the corrosion of equipment and valves, such as chrome-nickel stainless steel in sulfuric acid containing no oxygen, the great state of cremation within the range of solubility, corrosion more serious, but a small amount of copper sulfate or nitric acid and other oxidants, can change the passive stainless steel surface generates a layer of protective film to prevent the medium of etching, in hydrochloric acid, if a small amount of oxidant, which reduces the corrosion of titanium.

介质中添加缓蚀剂，可使设备和阀门的腐蚀减缓，如铬镍不锈钢在不含氧的硫酸中，很大的溶度范围内成火化态，腐蚀较严重，但加入少量硫酸铜或硝酸等氧化剂，可使不锈钢转变钝态，表面生成一层保护膜，阻止介质的的浸蚀，在盐酸中，如果加入少量氧化剂，可降低对钛的腐蚀。

The results showed that the amount of nitrogen mineralized from the green manure added to soil was corelated with the effective cumulative temperature i.e.y=k[(T—15)D]~n in which y is the amount of nitrogen mineralized, D the number of days, T the actual temperature during incubation and k and n constants.

结果表明，在20—30℃淹水培养条件下，加入土壤中的绿肥氮矿化率与有效积温(T—15)D的关系，符合y=K[(T一15)D]~n经验公式的规律。

Based on the geometric characteristics of the zone, the allowable discharge amount and the cut-down amount were estimated by inversion method.

并利用污染带的几何特徵参数反演推算了允许排污量和削减量。

Depreciation expense is a charge against taxable income, which reduces the amount of taxes paid, and as a result, increases the cash flow attributable to an investment by the amount of those taxes saved, but depreciation expense under existing tax laws is based on historic cost.

折旧费用是计入应税所得，这样可以减少纳税，结果，增加现金流量是因为这项投资税额的减少，但是在现行税法的折旧费用是根据历史成本计算的。

In the end, the synthesis condition and influential factors of PU-titania (TiO2) process, such as manufacturing sol (including the amount of water, the amount of PU/Titanium butyrate, the concentration of the solution, the pH value, the kind of alcohol), aging process, theoretical analysis of the dipping process, dry and heat treatment of the gelation, were also discussed especially. FT-IR、SEM、TEM、DLS techniques were applied to analyze and study the reaction mechanism and watch the surface and section of the PU-TiO2 membrane. According to above, it was inferred that PU-TiO2 membrane (containing K600) was better composite.

本文采用原位合成法制备了聚氨酯-二氧化钛水分散复合体，并着重对影响制备稳定透明的复合体的因素（包括加水量、醇的加入量、pH值、聚氨酯/钛酸四丁酯投入量、醇种类）进行讨论，利用红外光谱技术分析聚氨酯-二氧化钛分散复合体的结构，动态光散射技术与扫描电镜分别表征复合分散体的粒径大小与分布及复合膜的表面形态，结果显示含K600的聚氨酯-二氧化钛体系复合情况良好。

Chinese traditional virtue is humility and wariness,the compliment and praise to the others should be declination

中国人的传统美德是谦虚谨慎，对别人的恭维和夸奖应是推辞。如

We bought this house on the never-never.

我们以分期付款的方式买下这座房子。