产下

The results of continuous experiments with BAF show that: the short nitrification occurs when the Qair/Qinfluent ratio is 4:1 with NO_2~--N accounting for 72% of NOx--N; the suitable recirculation rate is 200%; the ratio of external acetate dose to NH4+-N concentration is 2:1 attributing to the short nitrification; BAF needs being backwashed when the headloss increases to 6 cm every 17~20 days; in the water reuse context, 98.7% water yield can be obtained.Lastly, the long-term operation of SBR-BAF system indicates it can treat the wastewater efficiently.

BAF反应器连续流试验结果表明：最佳气水比为4：1，硝化类型以短程硝化为主，NO_2~--N占到NOx--N的72%；综合考虑对TN的去除率和动力消耗，最佳回流比为200%；最佳缺氧/好氧容积比为3：5；由于短程反硝化较全程反硝化碳源需求量低，在BAF反应器进水NH4+-N 40mg/L左右的情况下，乙酸钠投加量为80mg/L以COD计设定水头损失达到6cm时进行反冲洗，随水温不同，反冲洗周期为17~20d，产水率为98.7%。

These are foundation stones of biological classification of the genus Bifidobacteria. The designation of species and biotypes is on the basis of carbohydrate fermentation physiological characteristics and DNA-DNA homology studies.

在婴儿和成人的肠道、阴道和口腔以及许多动物的消化器官中都可检出双岐杆菌，它们可分为人类种群、非人类种群，并具有不同的生物型。1双岐杆菌的形态双岐杆菌是无运动性不产芽孢的杆菌，在不同条件下呈现不同的形态。

The paper has studied the characteristic and reason for flood in cities in tidal river area, and then has summed up the assignments faced with and existent problems in the area. Considering the question of flood prevention of cities in terms of the characteristic of water system and difference drainage basin surface, the area is divided in to coteau and campagna.

根据下垫面的不同及水系特点，将研究区域分成山区和平原区，平原区再细分为水面、水田、旱地、城镇四类，分别采用不同的产汇流方法进行计算，再运用河网非恒定流方法计算河道断面洪水要素。

In optimum condition, it had the highest elastase production of 274.7 U/ml.

在此发酵条件下，该菌产酶水平为

And some anesthesiologists have expressed concerns about performing epidurals, used during labor, through those symmetrically designed female lower-back tattoos because of the slim possibility that the needle might carry pigment into the spinal canal.

而且一些麻醉医师曾经表示在产程中进行硬膜外麻醉，从那些女性下背部精心设计的文身图案中进针时常常担心针头将颜料带入椎管内。

Densely tufted fern ally of southwestern United States to Peru; curls up in a tight ball when dry and expands and grows under moist conditions.

产于美国西南部至秘鲁的浓密成簇状的拟蕨类植物；干旱时卷成紧密的球形，在潮湿的条件下伸展、生长。

The flash butt welding parameters, such as flash model, flash velocity and initial clamp distance were analyzed quantitatively. The rule of heat producing and temperature distribution by different welding parameters in coupling with electric and heat was researched.

对钢轨闪光焊过程中闪光模式、闪光速度及起始夹具距离等规范参数的变化规律进行了定量分析，揭示了电热耦合过程中不同焊接规范组合下的产热规律和温度分布规律。

The results of the experiments show that the model simulated the actual process by flash butt welding accurately.Using the electric-heat coupling model built, this work discussed how to get the temperature field with different welding parameters and its effect conditions.

对电阻闪光对焊过程中伸出长度、闪光模式、闪光速度等规范参数的变化规律进行了定量分析，揭示了电热耦合过程中不同焊接规范组合下的产热规律和温度分布规律；利用所建立的闪光对焊热力耦合模型计算了顶锻过程中顶锻接触行为的主要影响因素与规律。

But when the amount of catalysts is too large, the space time yield of methanol and the conversion of syngas gas will not increase at constant ratio.

同样的条件下，随着空速的增加，时空产率在增大，但气体的转化率在下降。

There is a lot of debate among institutes and scholars on the type and characteristic of sedimentary facies in the 8th member of the Middle Permian Lower Shihezi Formation which is the main gas-producing strata.

苏6井区是鄂尔多斯盆地苏里格气田主要产气区，主产层为中二叠统下石盒子组第8段，其沉积相类型及特征长期倍受众多研究机构和学者的争议。

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。